Donald Trump cannot win the 2020 election. But the Democrats can certainly lose it, just as they did in 2016. In fact, they seem determined to do so. They have already put forth dozens of potential nominees, most of whom have no chance of success.
Trump fell short in the popular vote the last time around. Since that time, he has surely lost more votes than he has gained. First, he has not fulfilled the promises he made during the campaign. Second, he made himself even more offensive than he was four years ago. And third, his in-house helpers vacated the White House and its environs in record numbers.