Viewers commented after President Trump's third State of the Union address.
www.c-span.org
I'm not sure how my browsing led me to this clip, but the whole video was shocking. Several self-proclaimed Democrat callers were VERY disdainful towards their parties' conduct during the speech, talking of quitting the party. Assuming they're not crank callers (and why would anyone put in the effort to troll C-span of all things) I think it hints at a larger trend of regular voters being fed up with congressional democrats.
I had a similar epiphany watching this video of
an Iowa voter who wanted to change her primary vote after belatedly learning that Buttigieg was gay. I wondered "And how many other Democrats are like that?" Which isn't to say something infantile like "Dems are the REAL homophobes". Rather, videos like that really show that the screen-addicted news junkies, tumblr/twitter ranters and, dare I say, Spacebattles users, make up a small percent of the Democrat voting base. Many of them might be like the woman in the video, who was so low-information that only on the day of the Iowa caucus did she learn that Pete Buttigieg was a gay man. Or they're like those C-span callers, watching the behavior of Congressional Democrats and seeing a party that doesn't gel with their own views, deciding of their own volition that it's time to split.