If there was some doubt that Barack ObamaBarack ObamaBoos for Obama as Trump speaks at Boy Scout jamboree Feehery: Winning August Overnight Regulation: Trump looks to repeal Obama fracking rule | States sue EPA over chemical safety | Regulators mull future of 'Volcker Rule' MORE would carry California, the Field Poll helps erase it.

Obama leads John McCainJohn McCainMcCain returning to Senate on Tuesday Senate Dems launch talkathon ahead of ObamaCare repeal vote Overnight Healthcare: Trump pressures GOP ahead of vote | McConnell urges Senate to start debate | Cornyn floats conference on House, Senate bills | Thune sees progress on Medicaid MORE 54 percent to 30 percent. Among Obama supporters, 54 percent said they're very enthusiastic about their candidate, while just 17 percent of McCain supporters said that.

Though the Illinois Democrat lost his party's primary to Sen. Hillary Rodham Clinton (D-N.Y.), her absence from the ticket makes little difference. Just 9 percent of Democrats polled said that not choosing Clinton makes them less inclined to back Obama in November. More Democrats than not -- 48 percent to 40 percent -- oppose Clinton as the Democratic vice presidential nominee.