Some more about D.C. While the rule is they otherwise get as many electors as they would if they were a state, the can have no more electors than the least populous state. Right now, that restriction doesn't matter. Wyoming is currently the least populous state, with 3 electoral votes (a voter in Wyoming has the most weight on average), but D.C comes out to 3 by the regular calculation anyway.

But, if D.C.'s population were to increase enough to raise the total to four, the rule would kick in and hold it at three.

-Richard