GOP nominee continues to warn of voter fraud on campaign trail.
GOP presidential nominee had not said whether he would accept results at Wednesday’s debate.
V.P. nominee aims to energize volunteers.
Wants to counter Trump's claim of rigging
Incumbent still holds 13-point lead in Quinnipiac survey.
Incumbent has 13-point advantage
2008 recession, support of presidential candidates major sparring points.
VP candidate visits days after the campaign severed ties with the chairman of the Ohio Republican Party.
Pair clash over records, top of presidential tickets.
Republican vice presidential nominee speaks in Columbus.