Why are people I respect supporting John McCain?

Romney endorses McCain for re-election

The link is to a CNN report via hotair about Mitt Romney endorsing John McCain for re-election to the U.S. Senate.

Has he gone mad along with Palin? I liked Palin and Romney but they both just took a major dive in personal popularity for me. John McCain is a BIG part of the GOP’s problem, not the answer! That man has done more to damage Republicans than anyone else so why endorse him? J.D. Hayworth will NOT throw open the borders and legalize anyone who struts across it and he won’t support runaway spending sprees like Johnnie Mac.
I’m sorry, because I already know that some posters at RS will sic on me and tell me I’m wrong but McCain’s record speaks for itself and it isn’t one to be proud of, especially over the past 8-9 years.

I’m so disappointed in Romney, so very disappointed.