I'm betting it is to hammer home the fact that Iraq had an election and that America is no longer threatened by Iraq. Either Iran or Osama would not have been scheduled two days ahead.
Far from it if we're to believe some excerpts were posted on CNN:
"President Bush will say Sunday, according to excerpts of a prepared speech, that Iraq's elections signal the birth of democracy in the Middle East, arguing against a U.S. troop pullout while acknowledging the doubts of some "that the war is lost and not worth another dime or another day." The president's speech says that last week's voting for parliament will not bring an end to the violence in Iraq, where he has estimated that 30,000 civilians and more than 2,100 Americans have died. But Iraq's election, 6,000 miles away, "means that America has an ally of growing strength in the fight against terror."