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) -- Monthly filings by super PACs tell a fairly typical story: Labor unions for Barack Obama and CEOs for Mitt Romney.

The National Air Traffic Controllers Association PAC donated $1 million, which made it the largest April donor to Obama-backing super PAC Priorities USA action. Self-employed hedge fund manager John Kleinheinz sent the same amount to top the list of Romney-supporting super PAC Restore Our Future.

Priorities USA's second biggest donor in April was the United Association of Journeymen and Apprentices of the Pipe Fitting Industry at $250,000. The third largest donor was


(MASI) - Get Masimo Corporation Report

Chief Executive Joseph Kiani who sent $100,000. shows that most employees of Masimo, a medical technology company, have donated directly to the Masimo PAC. Obama has received $10,000 from various company employees, but only one -- Jon Coleman, president of marketing -- has donated directly to Romney's campaign at $250.

Bob Perry, CEO of

Perry Homes

in Houston, is a perennial Romney donor who in April sent another $750,000 to Restore Our Future. He has sent $4.7 million to the super PAC in this election cycle.

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CEO Leslie Wexner donated $250,000 to the super PAC, which tied him for the third biggest donation with

Bain Capital

Managing Director Stephen Zide and

Select Medical Holdings

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Executive Chairman Rocco Ortenzio.

-- Written by Joe Deaux in New York.

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