Here are three factors that should worry Trump and the GOP:
The midterm results were actually a terrible leading indicator for him. Turns out that without Hillary atop the ticket, Midwest states like Wisconsin are tough for Trump, and Southern states with rising Hispanic populations are slowly growing more Democratic. Long term, the GOP should be freaking out about this.
Trump and the GOP face two years of public investigations, coming from three different and dangerous directions: Robert Mueller, the state of New York and Congress. Two years of probing hell await.
The prolonged recovery is on borrowed time, and a recession could well hit at the worst possible time for Trump — in the thick of the presidential race. Live by the markets, die by the markets.