Joe Biden has told the Pennsylvania delegation at the Democratic convention that his running mate Barack Obama (web|news|bio) can't win the White House without the Keystone State.

The Delaware senator is a native of Scranton, Pa. Obama has struggled to gain support from white, working-class voters, and he's hoping Biden can help him avoid a repeat of his Pennsylvania primary loss.

Polling in Pennsylvania finds the race to be close. A Quinnipiac University poll conducted last week showed Obama with a 7-percentage-point lead in the state over McCain, but neither with more than 50 percent.

Biden is a popular figure in Pennsylvania. He's worked with the state's political leaders throughout his more than three decades in the Senate and is often referred to as Pennsylvania's third senator.

(Copyright 2008 by The Associated Press. All Rights Reserved.)

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