Francis Wilkinson: Trump's hyper-partisan presidency
Middle-class tax cuts, infrastructure spending and other Trump campaign promises could have lured susceptible Democrats, at least occasionally, into a GOP-led majority.
President Donald Trump congratulates Senate Majority Leader Mitch McConnell of Ky., while House Speaker Paul Ryan of Wis., watches to acknowledge the final passage of tax overhaul legislation by Congress at the White House in Washington, Wednesday, Dec. 20, 2017. (AP Photo/Manuel Balce Ceneta)