The fact that they aren't honoring the pledge is pretty shady. If you weren't prepared to honor it than you shouldn't of signed it. Rand Paul is the person they should be emulating.
"“I took a pledge when I ran for president to not run as an independent candidate and to support the Republican nominee,” Paul said. “I stand by that pledge, and I think that anybody who signs their word to a document ought to take it seriously before they sign a document. So I don’t think there’s any question that those who signed the document ought to say, ‘you know what? I honor the pledge.’”"