This is being portrayed at 5D Chess to rile the liberals to go vote, a hand out to Trump for his son, and everything inbetween. If it was not so serious it would make for a grand drama.
Another way to look at it is an 81 year old retiring from his high-pressure job to spend more time with his grandchildren. Maybe he's such a professional that he didn't even let partisanship or worries about his legacy factor into his decision.
How are the right-wing news outlets covering this? Are they hailing him as a hero?