In last presidential debate, McCain makes starkest break yet with Bush, invokes an Ohio plumber to discredit Obama's tax policies.
South Dakota, Colorado, and California weigh measures.
Hayley Colley of Tennessee is among the Americans who, on Nov. 4, will cast votes in a US presidential election for the first time.
Obama now leads in states with many older voters.
Southeast Ohio, where many small communities are economically hard-hit, may be a bellwether.