This is a composition effect. Democratic candidates who run for safer, more left-wing constituencies feel free to propose more radical left-wing policies, especially if their main threats are other democrats during primaries. They then go on to win because they're not running in competitive elections. You can use the same reasoning to conclude that Republicans who attack abortion and socialism do better in elections.
I don't buy it. Red states hate billionaires even more than blue states. Centrist Democrats have nothing to offer to Republican voters to change their minds. Progressives speak directly to the economic issues that plague red states.
They elected a billionaire because he attacked other billionaires. He voices their rage at the "elitists" in Washington, and he pretends to be one of them.
And they love oil barons, and bankers are their heroes, and Jeff bezos is soooo cool with his penis rockets.
They really love billionaires more than they hate them. They just don't like the charity ones.