Overwhelmed by the information overload? Drowning in a sea of demographically sliced-and-diced exit-polls from every polling booth in the nation? Have no fear, Citi has created the ultimate election night cheat-sheet of the bellwether-est counties in the swing-est states. As they note, over the past three elections, these counties' vote totals have been very close to the statewide results, and they've picked the statewide winner each time. This makes them early indicators of the electoral vote winner in their states. Whether a Sun Belt growth county, an exurb, a middle class university area or a Midwestern farm community, all these areas are representative of key demographic groups wooed by both the two parties over the past decade.