The Campaign Trail - Sept. 29 - Oct 5 (32 images)

Singer Bruce Springsteen waves to the crowd as he gathers up his music after performing a free concert in downtown Philadelphia October 4, 2008. Some 50,000 gathered on Ben Franklin Blvd. for the Obama campaign sponsored "Get Out The Vote" rally and concert. . (UPI Photo/John Anderson)

Republican vice presidential candidate, Alaska Gov. Sarah Palin waves to supporters during a rally in Carson, California on October 4, 2008. Palin accused Democrat Barack Obama of "palling around with terrorists" because of an association with a former '60's radical, stepping up an effort to portray Obama as unacceptable to American voters. (UPI Photo/Jim Ruymen)

Democratic vice presidential nominee Sen. Joe Biden (D-DE) participates in the vice-presidential debate with Republican vice presidential nominee, Alaska Gov. Sarah Palin at Washington University in St. Louis, Missouri, on October 2, 2008. (UPI Photo/Brian Kersey)

Republican vice presidential nominee, Alaska Gov. Sarah Palin participates in the vice-presidential debate with Democratic vice presidential nominee Sen. Joe Biden (D-DE) at Washington University in St. Louis, Missouri, on October 2, 2008. (UPI Photo/Brian Kersey)