Sorry, but this is total bullshlt. Those politicians are moderate COMPARED to the Democratic base. Non-Swing Voter is literally making partisan Republican arguments on economic issues, arguing for tax cuts, reducing the social safety net, demonizing a more socialized economy, scoffing at tax hikes for the wealthy and literally wants to repeal Obamacare. Not a single one of those politicians you named would support a single one of those measures. He's VERY out of place in the Democratic Party.
I agree, but it should also be noted that things like talking about cutting taxes and repealing Obamacare don't even really mean anything anymore, and are really just Republican Party rituals, as the vote to actually repeal Obamacare demonstrated.