The ironclad commitment each Republican presidential candidate gave to support the party's nominee -- no matter who that may be -- is no more.

Donald Trump and Ohio Gov. John Kasich explicitly renounced the commitment they'd made last fall, while Texas Sen. Ted Cruz said he'd have a hard time supporting Trump. The comments, which could reshape an already raucous GOP primary race, came during a town hall in Milwaukee, Wisconsin, one week ahead of the state's key primary....

Trump handled the controversy over his campaign manager's arrest earlier Tuesday on a simple battery charge in his signature style -- defending the aide and attacking the accuser....

Kasich stays above the fray

All eyes were on Kasich heading into the town hall to see whether he would go after Cruz....

But when Kasich got on the debate stage, his typical easygoing demeanor was on display....

In a moment that got one of the loudest cheers from the audience all night, Kasich argued that the campaign's bitter, personal moments have set a bad example for children....

The most important moment, politically speaking, was probably Trump's indication that he no longer was committed to supporting the eventual GOP nominee if it isn't him. Republicans have worried for some time that Trump might bolt for a third-party run, and the pledge was designed to prevent that. His staunch defense of his campaign manager, charged with misdemeanor assault in Florida for manhandling a reporter, could ultimately prove to be the bigger story if he is the nominee, as it will likely be featured as exhibit A in a campaign by the Democrats charging Trump is hostile to women.