On Tuesday November 2, 2004 , the Associated Press called the attorney general race for democrat James Eisenhauer over Tom Corbett, the Republican who would go on to win the governorship two years ago by 9%. Two hours afterwards it became clear that the AP had egg all over their face. Tom Corbett eventually won by 109,000 votes and the DEM conceded at midnight. This was despite Bush losing the state to Kerry by 2.5%.
Pennsylvania does not have early voting, but this lesson should extend beyond the Quaker state. States with early voting in the east could throw in Obammunist early voting majorities to discourage Romney votes in other time zones. The answer is BEWARE and keep your eyes on the prize.