The Republican nomination race has three more stages to go, and each of the three candidates left in it is concentrating on a different one.

First, the candidates have to win votes in the remaining contests to maximize the number of delegates bound to them on the first ballot. Second, they have to prevail in selecting delegates: making sure that their bound delegates stay with them on subsequent ballots should any occur, and that unbound delegates side with them. Third, they need to get delegates who are not with them to like them, so that they might vote for them on later ballots.

From my column in Bloomberg View.