This GIF of Trump mocking Rubio with a water bottle sums up the state of the 2016 campaign

The afternoon that could, eventually, be remembered as the moment when the Republican race went completely off the rails started with Marco Rubio tearing into Donald Trump over, among other things, grammatical errors in Trump's tweets.

And then it got weirder, as Trump, at a Texas rally, responded by mocking Rubio guzzling water during his response to the State of the Union address in 2012:

And mocking Rubio's ears:

Getting ugly: Trump says Rubio was putting on makeup with a trowel backstage. "I will not say that he was trying to cover up his ears."

— Steve Peoples (@sppeoples) February 26, 2016

And promising to remove libel protections for American journalists:

Trump threatens to remove the (very good) libel protections that U.S. journalists have.

— Byron Tau (@ByronTau) February 26, 2016

Oh, and sometime in there, Trump won Chris Christie's endorsement.