There’s a bit of a duality about perfect agreement within the voters for the party’s candidates and somewhat within the party membership itself. Yeah, there’s a lot of telling each other to piss off. There’s a lot of jockeying for the platform and the primaries. But come the general, it’s a minority of the voters who will sit it out or vote for a minor party. Sometimes it’s a large enough minority to hand things to the Republicans, though.