Joseph R. Biden

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Vice President Joseph R. Biden (center) and Interior Secretary Ken Salazar (right) walk in front of the Wall of Names, containing the names of the 40 passengers and crew of Flight 93, as they arrive for a memorial service at the Flight 93 National Memorial in Shanksville, Pa., on Tuesday, Sept. 11, 2012. (AP Photo/Gene J. Puskar)

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With the GOP platform calling for an end to government subsidies for Amtrak, Vice President Joseph R. Biden says, “I’m the biggest railroad guy you’ve ever known,” adding that he has ridden the train between Washington and his Wilmington, Del., home more than 7,900 times. (Associated Press)

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Vice President Joseph R. Biden has declared, “General Motors is alive,” but new numbers on the bailout’s cost could be problematic for the administration. (Associated Press)

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** FILE ** Vice President Joseph R. Biden and his wife, Jill, arrive in Charlotte, N.C., on Sept. 4, 2012, to attend the Democratic National Convention. (Associated Press)

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Vice President Joseph R. Biden and his wife, Jill, arrive in Charlotte, N.C., Tuesday for the Democratic National Convention. His enthusiasm and joviality are seen as assets. (Associated Press)

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Vice President Joseph R. Biden makes a campaign appearance at the Metro Detroit AFL-CIO Labor Day Rally on Monday, Sept. 3, 2012, in Detroit. (AP Photo/Carolyn Kaster)

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Vice President Joseph R. Biden delivers a speech at the National Railroad Museum in Green Bay, Wis., on Sunday. (Associated Press)

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Vice President Joseph R. Biden, seen here campaigning in Virginia earlier this month, said, “The Etch A Sketch is gone,” after Republican presidential nominee Mitt Romney tapped Rep. Paul Ryan to be Mr. Biden’s vice presidential rival. (Associated Press)

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Vice President Joseph R. Biden speaks at the Institute for Advanced Research and Learning in Danville, Va., on Tuesday, Aug. 14, 2012. (AP Photo/The Register & Bee, Steven Mantilla)

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Vice President Joseph R. Biden speaks in Las Vegas on Saturday on an audience member’s cellphone at the national convention of the Disabled American Veterans, which he addressed on behalf of the campaign. (Associated Press)

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Vice President Joseph R. Biden addresses the annual convention of the National Association for the Advancement of Colored People on July 12 in Houston. Mr. Biden has been dispatched by the Democratic ticket’s presidential campaign to shore up support with the party’s various constituencies and interest groups. (Associated Press)