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But, a bigger part of the math that made this race so tight was that Lamb also seems to have swung votes and outperformed Hillary Clinton across the board, doing 10 percentage points better than the 2016 Democratic presidential nominee.

Lamb, a 33-year old Marine Corps veteran and former assistant U.S. attorney has been locked in a tight battle with Saccone, a 60-year old, four-term state representative to represent the southwestern Pennsylvania district.

\"PHOTO:
Drew Angerer/Getty Images
PHOTO: Supporters monitor election returns at an event for Conor Lamb, Democratic congressional candidate for Pennsylvania's 18th district, March 13, 2018 in Canonsburg, Pennsylvania.
>

Tuesday’s special election was triggered by the resignation of Republican Rep. Tim Murphy last year following a report that he allegedly asked an extramarital lover to end her pregnancy.

Video: GOP candidate Rick Saccone: 'We're still fighting the fight'

The closely-watched contest has seen close to $10 million spent by conservative groups to boost Saccone and stave off concerns that the GOP is falling out of favor with the same blue-collar voters that propelled Donald Trump to the White House.

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