anti-establishment movement, and as we've seen here on DU those farther left than the typical mainstream liberal regard mainstream liberals as the enemy to be defeated, not allied with.
That means that in order to build the numbers needed to succeed, and of course to succeed in conservative states, they will have to join with those they have more emotionally in common with anyway, anti-establishment conservatives, particularly those who are current Trump supporters/previous tea partiers.
This wouldn't be the first time the far left and the strong-far right joined together to form a critical mass, but in the end they always battle for supremacy and either one side loses and the other takes over or the whole thing falls apart. If that happens, it's likely to be the plain old establishment right and left groups who step in to pick the pieces.
But I love the idea and do wish you the best of luck in rousting a bunch of these way too safe and comfy incumbents who like their jobs way too much for our good. As Rachel also pointed out, the only congressman to lose in the primary this year did so because he was on his way to prison! Even only partial victories would be great.
Identifying and running good new people is going to be problematic; government is no more a job for amateurs than law or medicine is, and there's the little probity problem; lots of people who seem honest and trustworthy, even to themselves, are not. In red states... Well, the trumpsters will be choosing them. One thing you guys do need to realize, btw, is that people in a lot of districts actually like their congressmen and do fight to keep them. It wouldn't actually be a bad idea to identify good reps and not attack them, mainstream liberal as that may sound.