Bush passed a bill that counted anime with children depicted sexually as child porn. This caused drama not just for loli/shota fans but for any anime fan as almost all anime characters are under 18. Other than one arrest there hasn't been much of this so I would say it has either been revised, ignored, or dropped. Just because I haven't seen anime companies charged with child porn or any other people who watch anime.
So in short yes the Republicans did support a ban of most anime if they supported Bush.
This cosmic dance of bursting decadence and withheld permissions twists all our arms collectively, but if sweetness can win—and it can—then I'll still be here tomorrow to high-five you yesterday, my friend. Peace. —Royal Tart Toter.