You saw this two years ago, one year ago and still today in the vast majority of Republican voters having his back through good times and bad.

Why it matters: Soon this could matter in consequential — and constitutional — ways.

With Democrats taking the House, Trump can anticipate impeachment proceedings — and knows that all it takes to save him is the loyalty of Senate Republicans, regardless of the evidence.

The chance of Trump needing the Senate — and perhaps the Supreme Court — to side with him on big legal matters flowing from various investigations is high. It certainly won’t hurt that he put two justices on the court, and a lot of men in the Senate.