In the US, yes. In other countries (also Alaska and Maine somewhat), the voting system (ranked choice voting, proportional representation, etc) allows for many smaller parties to form. Because no one ends up with 50+% of the vote, these groups have to come together to get things done. With first past the post (which is winner take all, which is heinously stupid), small parties cannot meaningfully form because they cannot possibly get enough votes to get into office.

Unless you get the same size voting base as Republicans, it still leads to a corpse.

Different word, same effect

First past the post ensures that any party that tries to splinter off dooms both themselves and the party from which they splintered.

What needs to happen is the democrats need to get tea partied.