Democrats, liberals, leftists, and moonbats, oh my!

Some people here and elsewhere have questioned my choice of terms for describing non-conservatives. Here's a run down of my typical usage, though don't consider it set in stone:

Democrat - a member of the Democratic Party; a registered Democrat; someone who votes for Democratic candidates; an "ashamed Republican"

Liberal - a self-styled "progressive" (though the question of what they're progressing towards remains - one can progress in a downward spiral); someone who has left-leaning politics, as opposed to moderates and right-leaning conservatives

Leftist - pretty much the same as "liberal"

Moonbat - the looniest of the liberals; tend to vomit up bizarre conspiracy theories about conservative Republicans; like to hold protests and rallies where anything - and I mean ANYTHING - goes; the Democratic Underground