One point is that the last eleven presidents who ran for reelection and faced no significant primary opposition all won.
Concomitantly, in all of US history only one senator - Warren G. Harding in 1920 - has ever defeated a governor - never mind a sitting POTUS - for election to the presidency. VP is not an executive position, merely political heir to the POTUS. Senators/VPs only beat other senators/VPs.
Add to that the fact that nobody who doesnt attain at least VP less that 20 years after attaining statewide office (senator or governor) has ever been elected POTUS. New presidents are shooting stars (Clinton, Obama, Trump) much more so than old warhorses like Bob Dole and Joe Biden.
Trump is right about one thing for sure: he will have a lot to live down if he loses to Biden. Especially now that we know for certain that Biden is as crooked as the day is long (not that that was actual news . . .).
I watched the interview .a lot of election history and a good explanation of democratic early voting..how the media says they are ahead but if your money is on the line there wrong..just to get the people who like to vote for the winner
Good research, thank you.