Each state gets a number of Electoral College votes equal to its total representation in Congress — both its representatives and its senators. But because each state gets two senators, no matter its size, voters in the smallest states have disproportionate influence over the outcome. On average, each of the 538 electoral votes should represent just under 600,000 people. But in some places, it takes less than half that to determine an electoral vote. It's not just Republican-leaning states that are so advantaged; Vermont, Washington, D.C., and Rhode Island all make the list, and Delaware isn't far behind. Meanwhile, it takes substantially more people than it should to swing an electoral vote in some other states — as much as 20 percent more than it should. And because congressional seats (and, thus, Electoral College votes) are only reapportioned once a decade after the census, the relative power of voters in a state can vary from election to election depending on whether it is losing or gaining population.