I know how the Dems and their politicians work, and right now I'm more willing to accept the guy just isn't stupid and can do some political math for the future in his head, more than he actually cared about anything other than the backlash for trying to suppress the story.
Which means he's a more...clever and Forward thinking Dem than most. That's not an insult, even if he does appear to be pants on head retarded about Ukraine aid.
We will get more info over the next...however long, this could be like daily Watergate Briefing for a while.