Sen. John McCain (R-Ariz.) kicks off his general-election campaign trailing both potential Democratic nominees in hypothetical matchups, according to a new Washington Post-ABC News poll. Sen. Barack Obama (Ill.) leads McCain, who captured the delegates needed to claim the Republican nomination Tuesday night, by 12 percentage points among all adults in the poll; Sen. Hillary Rodham Clinton (N.Y.) holds a six-point lead over the GOP nominee. Both Democrats are buoyed by moderates and independents when going head to head with McCain and benefit from sustained negative public assessments of President Bush and the war in Iraq.