That’s the big thing. For anyone living outside the US, the US has two parties - a too-conservative conservative party in the Democrats (where the hell is single payer health care? how is tuition so expensive? how is public education so neglected?) and batshit crazy lunatic fringe party in the Republicans.
If you poll people in the US on their actual political opinions, if you give them exercises where they sit down with a number of options to shape the federal budget, then you’ll find that leaving aside some idiosyncratic red herrings (e.g. Second Amendment) the US population is generally quite a bit to the “left” of the Democrats as well. US politics just has a way of not representing the interests of 80% of the population.