NEW : More viewers say Obama won the debate , poll shows . NEW : Romney wins first presidential debate, CNN says. NEW : McCain , Obama make frequent mention of `` Joe the plumber '' McCain , Obama start debate with talk of economic plans .
NEW : More viewers say Obama won the debate , poll shows . NEW : Candidates debate Bill Ayers , John Lewis , negativity . NEW : McCain , Obama make frequent mention of `` Joe the plumber '' McCain , Obama start debate with talk of economic plans .