Here's my idea:
Premise: Dems take back the House and more or less maintain the status quo in the Senate in 2018 running on a populist anti-Ryan/McConnell message. McConnell is ousted as majority leader for someone ideologically closer to Trump. Trump moves quickly to the center and starts making deals with the Democratic House on infrastructure, health care, etc. Several of these deals pass the Senate with Republicans using Manchin, Heitkamp, etc. to go around Cruz, Paul and other hardliners. The next Trump SCOTUS appointment is notably more moderate than Gorsuch.
Trump surges further with the white working class and makes gains with working class minorities while cratering with libertarians and the Chamber of Commerce crowd. Religious right base turnout falls, however, Democratic base turnout on the coasts is also down.
