[helloworld11]

This isn't quite right. U.S politics is much less party-centric than it is in many other countries. Basically, though you've got a vast majority of candidates for X or Y office who are either democrats or republicans, their platform tendencies can be quite diverse, even though they often go against the grain of their own party's nominal positions. It's somewhat subtle, but this detail of U.S party politics makes for a strong multi-party diversity of candidates even though there are formally only two parties that mean anything for votes.

This is how you can have, for example, a surprisingly moderate republican senator like Susan Collins, sharing the same party with someone like Trump. And then also in the same party, a Rand Paul type.