It’s an effective strategy, up to a point. “Vote for me because I’m not the guy you hate” is one of the oldest political strategies around. And Democrats have even openly said that they’ve been funding the most extremist right-wing candidates on the ballot for years to set up easy wins when people think their opponent is a nutjob. There was a lady who even wrote a book about how she won an election doing this. And then she lost to that same extremist in the very next election. Because what they’ve actually done is push the Overton Window further and further into extremism.