Republican presidential candidate Sen. John McCain, R-Ariz., bottom right, is surrounded by photographers while he greets supporters after delivering a speech during a campaign event at Carnegie Mellon University, Tuesday, April 15, 2008, in Pittsburgh. McCain called Tuesday for the federal government to free people from paying gasoline taxes this summer and ensure that college students can secure loans this fall, proposals aimed at stemming the public's pain now from the troubled economy. (AP Photo/Mary Altaffer)

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