Only 13 percent of Marco Rubio voters said they would switch to Donald Trump, according to a new poll, while 47 percent of them will back Ted Cruz.  However, John Kasich is siphoning away a potentially significant share of ex-Rubio supporters from Cruz at 27 percent.

The decision to divide the anti-Trump vote will nominate Trump.

Maggie Gallagher is a senior fellow at the American Principles Project and can be followed on Twitter @MaggieGallaghe.