Republicans captured Democratic governorships in at least 10 states, including some prime presidential battlegrounds, and hoped for even more gains.

President Barack Obama used a popular late-night TV satire show to try to rouse younger voters ahead of next Tuesday's congressional elections.

Barack Obama’s march to the White House appeared unstoppable as polls gave him a series of victories in key states.

Ohio voters have started casting ballots in the state that may again determine the US presidency, as Barack Obama struggles to thwart a John McCain victory there four years after it tipped the election to George Bush.