Vice President Joe Biden

Associated Press
FILE - In this Sept. 16, 2008 file photo, then-Democratic vice presidential candidate Sen. Joe Biden, D-Del. mingles with passengers aboard the Amtrak Acela train from Washington to Wilmington, Del. Warning to Amtrak from Mitt Romney and Republicans: You're on your own. The platform Republicans adopted at their convention includes a call for full privatization and an end to subsidies for the nation's passenger rail operator, which gobbled up almost $1.5 billion in federal funds last year.  (AP Photo/Gerald Herbert, File)

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Vice President Joe Biden on the 2012 campaign trail.

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