Joe Biden wasn’t the first candidate to call Elizabeth Warren a dogmatic, out of touch elitist; that was Klobuchar and Mayor Pete. In addition, if Warren is the nominee, Trump is going to make the elitist argument one of the centerpieces of his campaign, so she needs to find an effective way to deal with it. It might as well be sooner than later.
That said, the dynamics of making the argument at this stage are very different than they are in the general election. Biden is running the risk of offending a substantial part of the blue base by making what, in this case, truly is a potential GOP talking point.
It makes me uneasy. He needs to calibrate this line of attack very carefully, or it could backfire in a big way, because Warren isn’t the only one who needs to expand her constituency in order to win in 2020.