Romney in Pittsburgh attacks Obama on energy

Mitt Romney on Monday assailed Democratic President Barack Obama's energy polices and urged Pennsylvania voters to back him in the fall. He planned a second stop later in the day with Florida Sen. Marco Rubio.

The Cuban-American, first-term senator is considered a top potential pick for vice president. He's also the latest in a string of possible running mates to campaign with Romney, but is the first to get an audition since former Pennsylvania Sen. Rick Santorum left the race and Romney staffers formally began organizing the process of searching for a No. 2.

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