US voters are going to the polls for midterm elections, with control of the Senate among the issues to be decided.
As public campaigning gives way to the privacy of the voting booth, the make-up of the lower chamber, the House of Representatives, and three dozen state governorships are also at stake.
President Barack Obama is not on the ballot midway through his second term, but acknowledges that his policies are.
Republicans have rushed to agree, given Mr Obama’s low approval ratings. They said they would work to change the president’s policies but offered little by way of specifics.
Democrats did not defend the president so much as insist they are independent of him.
The main prize after the $4bn campaign is Senate control in a contest that sprawls across three dozen states.
With numerous competitive races and the possibility of run-offs, the outcome may not be known for days.