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Republican Gov. Paul LePage signed the bill in June, but opponents gathered 68,000 signatures in less than a month to challenge it.

Before the law was passed, Maine was one of just eight states to allow same-day voter registration. The two-day window still gives Mainers more time to register than states such as New York, which requires citizens to sign up a month before an election.

In Washington, voters will decide whether to remove from the state constitution a provision that requires voters in presidential races to have lived in the state for 60 days or longer before Election Day. The limit in other races is 30 days.

The measure, called Senate Joint Resolution 8205, is being depicted as an uncontroversial effort to clean up the state constitution. Analysts expect it to pass easily.