Donald Trump goes into today's midterm elections less popular than any president since Harry Truman in 1946. His approval rating is the second lowest of any president heading into a midterm since then. The latest Reuters/Ipsos poll puts him at 32 per cent, with 66 per cent disapproving.

None of that changes a single seat. Polls do not vote, and a president's unpopularity only turns into a new Congress when the people who disapprove of him go to the polls. Every House seat and a third of the Senate are on the ballot today.

Turnout is what has decided midterms before. In 2018, turnout jumped 11 points on the previous midterm, and voting among 18 to 29 year olds rose from 20 per cent to 36 per cent. Republicans lost 41 House seats that November.

George W. Bush was at 37 per cent in October 2006, a higher rating than Trump has now, and Republicans lost control of both chambers weeks later. Those results came from the people who showed up, not from the polls before them.

If you have not voted yet, find your polling place and check its opening hours, which vary by state. Bring the ID your state asks for. If you are in the queue when the polls close, stay in it: you still have the right to vote. If anyone tries to stop you, call 866-OUR-VOTE (866-687-8683).

Everything on the ballot, from the House and Senate races to the measures in your state, is in our midterms guide.