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

18th district special election goes down to the wire

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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Here’s what you need to know:

Who can vote?

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.

When are polls open?

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.

Why is there a special election?

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.

Why might the results be short-lived?

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.

<p>Credit: Associated Press</p>

Credit: Associated Press