This is the rhetoric of someone either not either not familiar with the political system, or intentionally trying to undermine the left by opening the door for conservatives.
false dichotomy. they may be familiar with the political system (even more than you or i), and not believe the same things you do. they may be a leftist. you are making up attacks on their person instead of dealing with the substance of their claims.
that's a thought-terminating cliche like saying it's common sense. if you can't support your position, that's no reason to go off attacking other people as malevolent or incompetent.