WASHINGTON (AP) — The stakes in Tuesday's election — which party will control Congress — are crystal clear. But when that will be known is impossible to say.

The Associated Press will be calling races in all 435 House districts and the 35 Senate contests that are up for election this year.

Control of the House depends on which party reaches 218 seats. Currently, 219 members caucus with Republicans, just one more than the minimum needed for a majority when all seats are filled. There are two vacancies now.

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