You’re just shitting all over quality candidates because you’re terrified of losing. You have this backwards logic of “I will only support them when they get support” and, if you truly believe that, you expect others to follow it as well. But if everyone follows it, where does that leave you?

By not supporting someone, you are contributing to what people see as “electable qualities” and YOU are saying that something can’t be done. This is how centrists, who are really just conservatives, have become so fucking pervasive.