This is painful to watch, but only in the sense that a really hot shower can be painful when you have a stiff back.
Basically, the Democrats’ problem here is twofold. One, the only reason why Hillary Clinton is the frontrunner is because it’s her turn and all the other options are worse. Two, the usual sleazy rationalization – “Hillary Clinton was an awesome Secretary of State! Especially when it came to Russia” – is taking a beating this week, given that it turns out that Russia stopped worrying about our response to anything just about at the moment that Hillary Clinton became Secretary of State. I’m sure that the Democrats will eventually come up with something else – they’re not all idiots – but until they do expect this kind of helpless stammering.