The USofA has antiquated First-past-the-post system; this is largely how a system founded by people opposed to party politics spiralled into a two party non representative bog hole.

Being opposed to MAGA and simply not supporting MAGA doesn't make a voter pro-Democratic Party nor does it mean they want to waste their vote on a minor Libertarian or other third party with the result that Democrats win.

The US electoral system fosters the stupidity that results .. the still Republican anti-MAGA are (mostly) afraid to vote Democrat, minority parties aren't viable, and popular opinion and public support for various policy is never reflected in legislation.

If the US had a better electoral system it'd see better outcomes.