Donald Trump and Ted Cruz aren't just competing at the ballot box Tuesday. They're also duking it out on Twitter -- in notably personal terms.
Trump launched the first salvo Tuesday evening, prompted by an attack ad featuring a racy photo of his wife, Melania, that was circulated in Utah. (He actually tweeted the message once, then deleted it and reposted to add his signature "Lyin' Ted" jab).
In fact, the Facebook ad was produced by an anti-Trump super PAC, not the Cruz campaign. Cruz responded that he was not behind the ad and made clear he was not thrilled with Trump's vague threat to "spill the beans" on Cruz's wife, Heidi.