Voters in Ohio's 12th congressional district are electing a replacement for former Rep. Pat Tiberi (R) on Tuesday. President Trump won the district by 11 points and Republicans have held the seat almost uninterrupted since 1920, but polls show an unexpectedly tight race between Republican state Sen. Troy Balderson, 56, and Democrat Danny O'Connor, 31. Republicans are pulling out all the stops. Trump held a rally for Balderson in Ohio on Saturday and tweeted his endorsement Sunday, Vice President Mike Pence has campaigned for him twice, and national Republicans have spent $3.5 million on TV ads attacking O'Connor and another half-million on get-out-the-vote efforts. This is the last competitive election before the November midterms.

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