One of the consequences of close presidential elections in the US is that one learns the minutiae of the complicated rules that govern it. One of those is that the winner of the contest is determined by who gets a majority of the 538 Electoral College votes. The votes are apportioned to the states, with each state given a number that is the sum of the number of its members in the US senate (two for each state) and House of Representatives (determined by its population size). Washington DC is not a state but for the purpose of presidential elections is treated as one with a single district and thus has three votes.
Since the number 538 is even, that leaves open the possibility of a tie result 269-269. In that case, the election is thrown to the House of Representatives, where each state is given one vote, determined by a majority vote of its congressional delegation. Since Republicans have a majority of the seats in a majority of states, this means that a tie vote will result in the Republican nominee becoming president. Hence each electoral vote matters.
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