In winning Texas by 16 points, winning Oklahoma, winning (as of this writing) Alaska, and finishing second in Alabama, Arkansas, Minnesota, and Tennessee, Ted Cruz has now solidified his grip on second place in the ‎GOP presidential race. He increased his lead over Marco Rubio in states won, votes won, and delegates won—and unless Rubio can win in Florida in two weeks (or John Kasich can win in Ohio), Cruz may soon be battling Donald Trump one-on-one (more or less) for the Republican nomination. But how can Cruz beat Trump?

The number-one thing that needs to be undone from the Obama presidency also happens to be one of the things that Trump knows the least about and on which he has the least-reliable impulses. That thing, of course, is Obamacare. It is not only the centerpiece legislation of Obama's presidency, but opposition to it unites Republican voters across the party more than perhaps any other issue. ‎ Trump is extremely suspect on it. But it's hard for Cruz to frame Trump as particularly unreliable on Obamacare when Cruz himself has yet to offer a clear plan to get to repeal. But that could potentially change overnight.

If Cruz were to advance a general-election-ready alternative, it would quench GOP voters' six-year thirst. It would widen and deepen Cruz's appeal with the GOP electorate. And it would elevate the issue of Obamacare to its rightful place in the race—to Cruz's benefit.

Anyone who thinks, like Trump does, that socialized medicine " works incredibly well" in Scotland, that he's going to "take care of everybody" and "the government's gonna pay for it," and that the remedy for Obamacare's 2,400 pages of federal largess is to lock the experts in a room and let them figure out a solution, is profoundly vulnerable on Obamacare. But no one without a general-election-ready Obamacare alternative can effectively prosecute that case.

With his big Texas win in hand, perhaps Cruz will now decide to up the ante on Obamacare. If he does, it could change the dynamics of the race overnight.