Five states hold primaries Tuesday: Arizona, Kansas, Michigan, Missouri and Washington.
In Washington, two Republicans who voted to impeach then-President Donald Trump in the wake of the Capitol insurrection are aiming to fend off primary opponents.
Washington's top-two primary system puts all candidates on one ballot and advances the top two vote-getters to the general election, regardless of party.
Washington is mostly an all-mail-voting state, and polls close at 8 p.m. PT, or 11 p.m. ET.
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