Democrat Conor Lamb leads his Republican opponent, Rick Saccone, by 641 votes in a special election conducted yesterday in Pennsylvania's 18th congressional district, a district Donald Trump won in 2016 by 20 points. As voters went to the polls, Politico noted that the GOP had largely abandoned what we've been told will be the party's main talking point in this year's elections: Republicans backed away from their signature tax-cut law in the final days of a closely watched special House election in the Pittsburgh suburbs — even though it's the very accomplishment on which they had banked their midterm election hopes.... For the weeks of Feb.