He had McCain to run against. And then Romney.
It’s all identity/tribal politics these day. Get your tribe to show up on election day and you win.
How Harris, a double box-checker will do, remains to be seen - but sad to say, our country is now at a point where electing a useless America-hater like her is not out of the question. We’ve imported a lot of people who share her antipathy to our homeland.
That said, baring unforeseen economic disaster or actual/for-real scandal - Trump wins again in 2020!