If parties insist on having interchangeablenames designed to make them look all nice and cuddly they shouldn't be surprised if opponents try to counter that. I mean names like Democratic and Progressive, and in the context of America, Republican. Buy "interchangeable" I mean there is no reason why the labels Republican and Democratic shouldn't be the other way roubnd, since both of them would at least claim to be both (lower case) republican and democratic.

Labels like Liberal or Conservative or Socialist are better, that relate at least in theory to political positions are preferable.

The cause of honesty in politics would perhaps be best served by labels such as "Bastards" and "Real Bastards". For example historical labels like Tory and Whig.