Washington (AP) - A freshman Democrat in a Republican district, Rep. Tom Perriello hit a dubious trifecta: He voted for President Barack Obama's stimulus bill, cap-and-trade climate legislation and the health care law. Now Obama, battling to limit Democrats' election losses even as he defends his own record, is heading to Perriello's southside Virginia district to try to salvage the congressman's tough but unexpectedly resilient re-election bid. -snip- So far, Perriello's campaign has defied the early predictions of strategists in both parties and prognosticators, staying competitive until the end. He still has an uphill fight to keep his seat. That's...