From the episode 'Stewie Loves Lois'
Stewie: Brian loves Olympia Dukakis.
Referencing Olympia Dukakis, the daughter of Greek immigrants, who has starred in many movies. She is also cousin to former (Democratic) presidential candidate Michael Dukakis. Probably Brian would love for for being liberal and also for being an older woman. (Like Lois to Stewie.)