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Democratic presidential hopefuls Hillary Clinton and Barack Obama should drop their windfall profit tax proposals for the oil industry, Jim Cramer told viewers of his "Mad Money" TV show Tuesday.

Cramer said those proposals, in particular, would have a negative impact on natural gas drillers at a time when natural gas represents a clean, plentiful source of energy that could easily lead the country towards energy self-sufficiency until better alternative options are viable.

Cramer Interviews Waste Management Inc. CEO

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Cramer has touted the growth of the industry, going so far as calling 2008 "the year of natural gas." He especially likes

Anadarko Petroleum

(APC) - Get Report

, which he called a "must buy" on March 25.

Since that recommendation, Anadarko shares are up $11.51, and Cramer says the stock could rise to $100 in the next 18 months.

Cramer extended his optimism to the entire natural gas sector. With the growth rates for a natural gas drillers averaging 15%, he said investors will be hard pressed to find such high growth in any other sector. He also mentioned the sector's excellent visibility as another plus.

Rounding out his favorite natural gas drillers, Cramer also recommended

Devon

(DVN) - Get Report

,

Apache

(APA) - Get Report

,

Southwest Energy

(SWN) - Get Report

,

Ultra Petroleum

(UPL)

and

Encana

(ECA) - Get Report

.

In addition, he mentioned

XTO Energy

( XTO),

El Paso

(EL) - Get Report

, and

ConocoPhillips

(COP) - Get Report

. He owns all three stocks for his

Action Alerts PLUS portfolio.

Cramer also had positive comments for

Nabors

(NBR) - Get Report

and

Halliburton

(HAL) - Get Report

.

Regarding the prices of oil itself, Cramer raised his price target from $125 to $150 a barrel. He told viewers that they "haven't missed the move yet."

A Big Upside Surprise

Cramer wore a brown paper bag on his head to hide his embarrassment for having recommended

NYSE Euronext

(NYX)

for the past year.

The company, though, turned things around in the past quarter and enjoyed a surprise to the upside. Cramer said that the turnaround was due to the leadership of CEO Duncan Niederauer.

Niederauer told Cramer that the quarter's results were the first to fully reflect the integrated NYSE and Euronext components. He said that the quarter proved the combined company is ready to handle record trading volumes without incident and investors should trade with confidence.

Niederauer also said much of his energy is now focused on the expense side of the business. He mentioned that the projected cost savings from the merger of $70 million a year hasn't fully kicked in yet, and that there's still additional cost savings to be realized.

Regarding the pending acquisition of the American Stock Exchange, Niederauer said they're ahead of schedule on closing the deal, and he expects that merger to be another great example of the synergies that can come from combining exchanges.

Cramer commended Niederauer for a job well done, saying, "NYX works."

Misjudging Comcast

Cramer apologized to viewers for staying too negative, too long on

Comcast

(CMCSA) - Get Report

and missing the bottom in the stock.

In an effort to have viewers learn from his mistakes, Cramer said that he was too focused on

Verizon

(VZ) - Get Report

and

AT&T

(T) - Get Report

, and mistakenly thought that additions of subscribers at those companies were coming at the expense of Comcast. In reality, this was not the case.

Cramer said "there is still a lot of growth left for cable." He said Comcast is enjoying growth in high-speed Internet customers as well as in cable TV subscribers from the upcoming analog-to-digital switchover.

Cramer also said he mistakenly assumed Verizon's FiOS fiber service would kill cable. There, he said he failed to consider that FiOS is only available in 22.9% of Verizon's coverage area. Comcast is the better alternative where FiOS isn't available, he acknowledged.

Comcast also surprised Cramer with its ability to compete with the phone companies by using aggressive marketing and by adding more features to its lineup.

Cramer also mentioned his surprise at Comcast listening to activist investors and buying back some of its stock, implementing the company's first dividend and cutting the multimillion-dollar benefit package of founder Ralph Robertson to $1.

Finally, Cramer said he misjudged Comcast's ability to fix its customer service problems. "Competition forced the company to address their issues," he said, citing the company's reduced repair calls for the most recent quarter.

Cramer said he thinks Comcast looks good here and is worth buying.

Waste Management: Part II

Cramer again welcomed David Steiner, CEO of

Waste Management

( WMI) to the show to discuss his company's outlook.

Steiner said that most of Waste Management's business is recession-proof and the company has a lot of leverage to bring to the market. While volumes had slowed down in previous quarters, they began to rebound in April and he expects the company to still meet its numbers for the year.

Steiner noted fuel costs are a concern, but most of those increased costs have been passed onto the customers via fuel surcharges. He also highlighted some of the company's push towards fuel efficient technologies and its efforts to cut fuel costs.

Cramer reiterated his buy on Waste Management.

Final Notes

Cramer said the strength in

Precision Castparts

(PCP)

and

Molson Coors

(TAP) - Get Report

should be the signal for investors to roll into

Alcoa

(AA) - Get Report

and

Altria

(MO) - Get Report

.

Image placeholder title

Lightning Round

Cramer was bullish on

Hewlett-Packard

(HPQ) - Get Report

,

Natus Medical

(BABY)

,

Marathon Oil

(MRO) - Get Report

,

Diana Shipping

(DSX) - Get Report

,

Frontline

(FRO) - Get Report

,

Deutsche Telekom

( DT),

Verizon

(VZ) - Get Report

,

AT&T

(T) - Get Report

,

Manulife Financial

(MFC) - Get Report

and

Agnico-Eagle Mines

(AEM) - Get Report

.

Cramer was bearish on

Western Refining

(WNR)

,

Valero Energy

(VLO) - Get Report

,

Sprint Nextel

(S) - Get Report

,

China Digital TV

(STV)

,

Vulcan Materials

(VMC) - Get Report

,

MGM Mirage

(MGM) - Get Report

,

Wynn Resorts

(WYNN) - Get Report

,

Coeur d'Alene Mines

(CDE) - Get Report

,

Advanced Micro Devices

(AMD) - Get Report

and

Smith Wesson

(SWHC)

.

Want more Cramer? Check out Jim's rules and commandments for investing by

clicking here

.

For more of Cramer's insights during the Lightning Round, click here

.

At the time of publication, Cramer was long XTO Energy, El Paso, Verizon and ConocoPhillips.

Jim Cramer, host of the CNBC television program "Mad Money," is a Markets Commentator for TheStreet.com, Inc., and CNBC, and a director and co-founder of TheStreet.com. All opinions expressed by Mr. Cramer on "Mad Money" are his own and do not reflect the opinions of TheStreet.com or its affiliates, or CNBC, NBC UNIVERSAL or their parent company or affiliates. Mr. Cramer's opinions are based upon information he considers to be reliable, but neither TheStreet.com, nor CNBC, nor either of their affiliates and/or subsidiaries warrant its completeness or accuracy, and it should not be relied upon as such. Mr. Cramer's statements are based on his opinions at the time statements are made, and are subject to change without notice. No part of Mr. Cramer's compensation from CNBC or TheStreet.com is related to the specific opinions expressed by him on "Mad Money."

None of the information contained in "Mad Money" constitutes a recommendation by Mr. Cramer, TheStreet.com or CNBC that any particular security, portfolio of securities, transaction, or investment strategy is suitable for any specific person. You must make your own independent decisions regarding any security, portfolio of securities, transaction, or investment strategy mentioned on the program. Mr. Cramer's past results are not necessarily indicative of future performance. Neither Mr. Cramer, nor TheStreet.com, nor CNBC guarantees any specific outcome or profit, and you should be aware of the real risk of loss in following any strategy or investments discussed on the program. The strategy or investments discussed may fluctuate in price or value and you may get back less than you invested. Before acting on any information contained in the program, you should consider whether it is suitable for your particular circumstances and strongly consider seeking advice from your own financial or investment adviser.

Some of the stocks mentioned by Mr. Cramer on "Mad Money" are held in Mr. Cramer's Action Alerts PLUS Portfolio. When that is the case, appropriate disclosure is made on the program and in the "Mad Money" recap available on TheStreet.com. The Action Alerts PLUS Portfolio contains all of Mr. Cramer's personal investments in publicly-traded equity securities only, and does not include any mutual fund holdings or other institutionally managed assets, private equity investments, or his holdings in TheStreet.com, Inc. Since March 2005, the Action Alerts PLUS Portfolio has been held by a Trust, the realized profits from which have been pledged to charity. Mr. Cramer retains full investment discretion with respect to all securities contained in the Trust. Mr. Cramer is subject to certain trading restrictions, and must hold all securities in the Action Alerts PLUS Portfolio for at least one month, and is not permitted to buy or sell any security he has spoken about on television or on his radio program for five days following the broadcast.