Crazy little fun fact: Although it would be highly unlikely to happen in any election, due to the way the Electoral College works, it is possible to become President of the United States winning only 11 out of 50 States, minus Washington D.C. The 11 needed, which would net 271 Electoral Votes: California(55), Texas(34), New York(31), Florida(27), Illinois(21), Pennsylvania(21), Ohio(20), Michigan(17), Georgia(15), North Carolina(15) and New Jersey(15).
And for those that are unsure of the Electoral College and how it works, just take a look at the Senate and House of Representatives. Each state has a number of Electoral Votes equal to the number of Representatives they have in the U.S. House as well as one for each Senator. So each state has the same amount of Electoral Votes representing it as they have representatives in Congress. That makes it so one large state like California or Texas, for example, can't just overwhelm the process with a majority of the voting public and push a candidate through with just the popular vote. If every registered Democrat or Republican in one of those states were to vote, then it would overwhelm any effect that a state with a smaller population like Rhode Island or Montana may have. So while sometimes it seems like it might not be fair(2000 anyone?), it does what it's intended to do.