Daniel Larison, writing at theamericanconservative.com, walks readers quickly through the post-Ohio victory landscape for John Kasich
If Rubio voters rally behind Kasich in Wisconsin, the governor could score another significant victory over the front-runner in the coming weeks. Neither Kasich nor Cruz will be able to win the nomination outright before the convention. However, by depriving the front-runner of wins in Ohio and maybe Wisconsin, Kasich can make it extremely difficult if not impossible for Trump to secure the needed majority of delegates in time.
Kasich won in Ohio by six points, and as I said in this piece he is now the strongest competition for Trump among somewhat conservative and moderate Republican voters. The best thing Rubio could do for the anti-Trump cause was to get out of the race.