Most liberal-leaning media in the US went absolutely insane over Russiagate. You wouldn't do much better by watching CNN. Every day, the walls were closing in, the big breakthrough was right around the corner. I don't doubt that liberals are typically more "sophisticated" than conservatives in the US, but that doesn't translate into political sense. The greatest condemnation of their sophistication is that so few of them predicted Trump's election, and that so many still have no idea why he won. That's why the Russiagate narrative is so popular among American liberals. It gives them an easy way to explain a phenomenon that they fundamentally do not understand.