And in-depth look at O'Rourke

From 538. He's more of a mixed-bag. The summary follows. See the link for a lot more detail.

"I might classify O’Rourke as fairly liberal on issues around culture and identity and left-leaning but maybe not particularly liberal — compared with, say, Sanders or Elizabeth Warren — on economic issues. (Cory Booker and Kamala Harris probably fall in this camp with O’Rourke.) Part of what’s confusing in assessing O’Rourke’s ideology is that the results are different depending on what benchmark you choose. Is he liberal compared with previous Democratic presidential candidates? Yes. Is he liberal compared with the activists dominating the discourse in the party now? No."