Biden offers praise for Lamb following Pennsylvania House race
© Greg Nash

Former Vice President Joe BidenJoe BidenImpeachment week: Trump probe hits crucial point Trump DACA fight hits Supreme Court Juan Williams: Honesty, homophobia and Mayor Pete MORE on Wednesday praised Democrat Conor Lamb after Lamb declared victory in his bid for a Pittsburgh-area House seat in a special election.

"The people of Pennsylvania’s 18th district showed up yesterday," Biden tweeted.

"They demonstrated that they want to be represented by someone who stands up for working people with actions, not just words. Who has heart. They found that in @ConorLambPA. He will represent them well."

The special election House race in Pennsylvania remained too close to call Wednesday.

Lamb's chances of completing an upset win over Republican Rick Saccone were promising, and the Democrat declared victory early Wednesday morning.

Lamb led by 641 votes with 100 percent of the precincts reporting Wednesday morning, according to The Associated Press. There were still some absentee ballots to be counted.

"It took a little longer than we thought, but we did it. You did it," Lamb told supporters at his election night party shortly before 1 a.m., after he was introduced as "congressman-elect."

Republicans indicated Wednesday they will not be conceding anytime soon. 

There are still about 203 absentee ballots and then additional provisional and military ballots left to be counted, but Saccone would have to capture an unlikely overwhelming majority of those outstanding ballots to win. 

Saccone's campaign has not yet conceded, telling MSNBC that it will wait until all of those votes are in to assess the situation. That could take as long as a week. 

The national Republican Party, meanwhile, is hinting that it may seek to force a recount.