The Tea Party isn't Republican?

I guess maybe Chris McDaniel's fury at losing his runoff election to Thad Cochran kind of answers my question.

However, Dave Brat, the guy who knocked off Eric Cantor in that Republican primary, is making it explicit.

Brat admitted he had strong tea party and grassroots support, but he said he ran on the “Republican creed.”

“I ran on Republican principles, and those principles are what matter,” he said.

So, how exactly do Republican principles and Tea Party principles differ?

And aren't the Tea Partiers who despise establishment Republicans going to be pissed at Brat for essentially disavowing them and their principles?