When Brian learns that Rush Limbaugh is having a book signing, he goes to give the conservative a piece of his mind.  However, on his way home from the signing, Brian gets jumped by a multi-ractial gang and it's Limbaugh that saves his life.  Brian, as a result, agrees to read Rush's book and has a change of political heart.  He becomes a conservative and argues so much with Lois, he moves out and in with Rush.  Eventually, Rush kicks him out for being still being a liberal... because he cares about stuff.  Seriously.