As I have said, every political party has a core percentage of the electorate
that will vote for them no matter what. But they are not large enough in number
to win an election.
That exposes the real problem with the American political system, though: by sticking to the electoral college system, even though it is at least three centuries out of date, this creates an atmosphere where people can get borderline militant about voting for their party no matter who they put up on the podium - and also an atmosphere where the election basically hangs on how four states out of fifty vote.
In fact I'll go one step further: so many problems about the US boil down to them slavishly sticking to a piece of parchment written in the late 18th century as if it were holy scripture, which has led to certain groups holding up the Constitution as the ultimate trump card - not least the NRA and their decades of misquoting the Second Amendment, which means any attempt to have a rational and informed debate about gun control gets stomped on by an irrational and uninformed pro-gun nutjob every single time.
Yet here's the issue: most other countries with a constitution don't stick to the first one they wrote, they actually draft new ones because we aren't living in 1886 anymore and the world has changed in ways that Thomas Jefferson and company had no way of predicting - hell, I doubt FDR could have predicted the ways the world would have changed, and he was POTUS 75 years ago rather than the best part of 250 years ago.
For example, since 1776...
France has had fourteen constitutions - it would have been sixteen, but a slight case of Revolution got in the way
Greece have had thirteen constitutions
Spain have had ten constitutions
Russia has had seven constitutions, eight if you count a period in the late 70s where Russia had one constitution while the USSR had another
Italy has had seven constitutions
Austria has had seven constitutions - worryingly, they had ones in 1848, 1848/9 and 1849
Germany has had at six constitutions (eight if you count East Germany's)
Turkey has had four constitutions
It looks especially bad when you realise that even Vatican City has had a constitution drafted since then.