SPECIAL ELECTION: Things to know about Tuesday's 18th Congressional District special election

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Voters are heading to the polls Tuesday to cast their vote in the 18th Congressional District special election, a close race between Republican Rick Saccone and Democrat Conor Lamb.

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Polls are open from 7 a.m. to 8 p.m. If you’re in line when the polls close, you are entitled to vote.

Here’s what you need to know:

Pennsylvania's 18th Congressional District consists of parts of Allegheny, Westmoreland, Washington and Greene counties. Allegheny County makes up the largest pool of voters, while Greene makes up the smallest.

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The seat was opened when Rep. Tim Murphy resigned in early October after text messages surfaced in which he urged his mistress to get an abortion. The eight-term Republican had held a strong anti-abortion stance.

The winner of the election will only hold the seat until the end of December, after the Pennsylvania Supreme Court ruled an old congressional district map unfairly favored Republicans. The newly issued map of Pennsylvania's 18 congressional districts is expected to be in effect for the May 15 primary.

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Credit: Associated Press

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