Pennsylvania special election

Republican Rick Saccone thanks supporters at the party watching the returns for a special election being held for the Pennsylvania 18th Congressional District vacated by Republican Tim Murphy, Tuesday, March 13, 2018, in McKeesport, Pa.

Conor Lamb, center, the Democratic candidate for the special election in Pennsylvania’s 18th Congressional District, arrives to vote in Mount Lebanon, Pa., Tuesday, March 13, 2018. Lamb is running against Republican Rick Saccone.

A crowd gathers in the ballroom of the Youghiogheny Country Club as they await returns for Republican Rick Saccone in the special election for the Pennsylvania 18th Congressional District seat vacated by Republican Tim Murphy, Tuesday, March 13, 2018, in McKeesport, Pa. Saccone is running against Democrat Conor Lamb.

Supporter of Conor Lamb, the Democratic candidate for the March 13 special election in Pennsylvania’s 18th Congressional District, Judy Kramer of Bavington, Pa., arrives early for Lamb’s election night party in Cecil, Pa., Tuesday, March 13, 2018.

Republican Rick Saccone, center, is surrounded by cameras and reporters as he heads to the polling place to cast his ballot, Tuesday, March 13, 2018, in McKeesport, Pa. Saccone is running against Democrat Conor Lamb in a special election being held for the PA 18th Congressional District vacated by Republican Tim Murphy.

Conor Lamb, the Democratic candidate for the special election in Pennsylvania’s 18th Congressional District, makes his way through a crowd of media after voting in Mount Lebanon, Pa., Tuesday, March 13, 2018. Lamb is running against Republican Rick Saccone.