Very simple litmus test: anyone who doesn't despise John Bolton as a warmongering ghoul is not on the left. Anyone in the DP who received John Bolton warmly was a centrist or neoliberal. There's nothing Bolton can do that can make up for what he's already done. Neither party has any real disagreements in their ideology, except that they each want power. That's why the DP is so quick to praise anyone on the right who lobs the mildest bit of dissent towards Trump. The DP is fully invested in defeating Trump but they don't actually disagree with the core values that he's operating from. It's the Reagan era repeating itself, and just like with the Clinton administration, the only thing that they'll change is that the (R) becomes a (D).