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NEW YORK ( TheStreet) -- Federal Reserve Chairman Ben Bernanke is set to speak again this week, and the markets wait in anticipation. But Jim Cramer told Lindsey Bell at TheStreet.com Wednesday that the substance of what Bernanke has to say isn't really that important. As long as the Fed chairman commits to keeping interest rates low for the foreseeable future, that will continue to make common stocks that much more attractive. Why would investors buy bonds or U.S. Treasuries yielding next to nothing when they can have AT&T ( T) yielding 4.5% or Dominion ( D) yielding 4% or Eaton ( ETN), a stock Cramer owns for his charitable trust,