Okay, so a few of the characters in the prequels take digs at American politicians. The not-so-subtle ones:
Nute Gunray (The Neimodian Viceroy.)
Lott Dodd (The Neimodian Senator.)
Orn Taa (The Twi’Lek Senator.)
Any others come to mind? Not necessarily digs, or from the movies, either. “Captain Cole” (Terrorist leader who scuttles a Trade Federation ship) from Cloak of Deception would qualify, I reckon. (I listened to the audiobook to hype myself for ep. II. I’m so ashamed.)