Well, I'm sure some of them are signalling to people who pay them, too. But I think it goes well beyond people who are paid. They're telling the world "This is

Well, I'm sure some of them are signalling to people who pay them, too. But I think it goes well beyond people who are paid. They're telling the world "This is what it means to be a [republican/democrat/etc.], and if you aren't like that yourself, you're with the enemy!". It's like an ultimatum to commit.