Hard right Republicans can dismiss Colin Powell as a RINO and thereby, at least in their own minds, discredit Powell's endorsement of Obama, but what about Ken Adelman?
Adelman's GOP roots go back to Goldwater. He seved in the Nixon and Reagan administrations. He was a chief proponent of the Iraq invasion and an advisor to Donald Rumsfeld.
Primarily for two reasons, those of temperament and of judgment.
When the economic crisis broke, I found John McCain bouncing all over the place. In those first few crisis days, he was impetuous, inconsistent, and imprudent; ending up just plain weird. Having worked with Ronald Reagan for seven years, and been with him in his critical three summits with Gorbachev, I’ve concluded that that’s no way a president can act under pressure.
Second is judgment. The most important decision John McCain made in his long campaign was deciding on a running mate.
That decision showed appalling lack of judgment. Not only is Sarah Palin not close to being acceptable in high office—I would not have hired her for even a mid-level post in the arms-control agency. But that selection contradicted McCain’s main two, and best two, themes for his campaign—Country First, and experience counts. Neither can he credibly claim, post-Palin pick.
McCain's ping-pong approach to campaign tactics and his appalling lack of judgment in the decision to select Palin should cause all thinking conservatives to question supporting Arizona's absentee Senator.