I’m old enough to remember when wingnuts were arguing that there was no evidence that the Trump campaign had had any contact with the Russians.

Then when they started to argue that talking with the Russians was “no big deal” because there was nothing illegal about it.

Now they’re moving onto excusing unethical and illegal behavior done involving the Russians because “Well, Obama…”

So when people ask “what will it take,” I suspect the answer is “a city going up in a mushroom cloud.” And even then, there will be those who insist the CIA planted it.