Is This the Tipping Point for Donald Trump?

Two days after Donald Trump belittled John McCain's war record and military service, the feud spilled over to Monday morning. Trump saying on NBC's Today, "I'm not a fan of John McCain. He has done a terrible job for the vets… Illegal immigrants get treated better than many of our vets, and John McCain hasn't done anything about it." In a normal world of politics and for a normal political candidate, this would be a tipping point: As the party abandons Trump, so would GOP primary voters. But this isn't a normal time in American politics, and Donald Trump isn't your normal political candidate.