(Reuters) - The special election in Pennsylvania’s 18th Congressional District was still too close to call on Wednesday but the winner could soon have to start campaigning all over again - in a different district against a different opponent for the November congressional elections.

Supporters of U.S. Democratic congressional candidate Conor Lamb react to the results coming in during Lamb's election night rally in Pennsylvania's 18th U.S. Congressional district special election against Republican candidate and State Rep. Rick Saccone in Canonsburg, Pennsylvania, U.S., March 13, 2018. REUTERS/Brendan McDermid

That is because the 18th District, as currently drawn in southwestern Pennsylvania, will cease to exist because of a recent court order that set new boundaries for every district in the state.

Democrat Conor Lamb, who was slightly ahead in the race for the seat in the U.S. House of Representatives on Wednesday, likely will start campaigning in the new 17th District. Republican Rick Saccone, should he still have a political future after failing to handily win a district Donald Trump carried by 20 points in 2016, might try for the seat in the newly drawn 14th District.

The political game of musical chairs could once again make western Pennsylvania hard-fought ground. Districts that were once considered solidly Republican and that voted for Trump in the 2016 presidential election now look winnable by Democrats.

Pennsylvania’s top court ruled in January that the state had been unfairly gerrymandered by Republican legislators, with districts shaped in order to include voters apt to favor their party. Pennsylvania Republicans, including eight U.S. congressmen, have filed a federal lawsuit challenging the new map.

“It’s a much more competitive map,” said Eric McGhee, a political scientist at the Public Policy Institute of California who helped craft an analysis of the new districts by PlanScore.org.

Saccone, a conservative four-term state representative from Elizabeth Township, lives in the newly drawn 18th District that will skew Democrat because it includes the strongly Democratic city of Pittsburgh.

But Saccone has already said he intends to run in the new 14th District, which will include much of the current 18th and strongly Republican communities to the west of it.

Political analysts label the new 14th District safely Republican. It has a higher share of people who have not studied past high school and its median household income, at about $55,000, is lower than the old 18th District’s $65,000, according to PlanScore’s analysis. Saccone might want to move to the new district, although Pennsylvania law does not require candidates to run in the districts where they live.

Graphic: Pennsylvania's new look

‘I WILL BE RUNNING LATER’

Lamb has not said which seat he would seek in November but was clear during the campaign that he intended to compete.

Political analysts and Pennsylvania Democratic strategists such as Mike Mikus believe the moderate Democrat would be a strong candidate in the new 17th.

Compared with the old 18th, the new 17th District will have a larger share of black residents and will be slightly more educated - segments of the electorate that skew Democratic.

Should Lamb run in the 17th, it could set up an incumbent-versus-incumbent showdown against Keith Rothfus, the Republican now representing the 12th District, a hammer-shaped district stretching from the Ohio border north of Pittsburgh to the Allegheny Mountains. Trump won that district over Democrat Hillary Clinton by 21 points.

Rothfus has said he will run in the new 17th, which takes in the western portion of his current district.

The newly drawn 17th District could be an easier district to win for a Democrat than Pennsylvania’s 18th. Trump’s vote tally in the new 17th would have barely won him the district. It includes the suburbs southwest, west and north of Pittsburgh where a large numbers of suburban Democrats might find Rothfus too conservative.

The new 17th District does include a swath of Republican strongholds stretching to the Ohio border. But Lamb could make inroads in the blue-collar Trump strongholds of traditionally Democratic Beaver County, where voters could be attracted by his pro-gun, pro-military and pro-union positions as well as his opposition to abortion rights.

“I would put Lamb or another Democrat as a favorite over Rothfus,” Mikus said. “Rothfus raises a lot of money but he is very conservative and probably too conservative for this district.”

Political analysts at the University of Virginia Center for Politics considered the new 17th District as leaning in Rothfus’ favor until last week, when they moved it to a toss-up in anticipation of a possible Lamb candidacy.

Graphic: Pennsylvania's new look, click tmsnrt.rs/2GquDcL