When Bush, issued a "signing statement" in 2006 on McCain's hard-fought legislation placing prohibitions on torture, saying he would interpret the measure as he chose, McCain barely uttered a peep. And then, in 2006, in one of his most disheartening acts, McCain supported a "compromise" with the administration on trials of Guantanamo detainees, yielding too much of what the administration wanted, and accepted provisions he had originally opposed on principle. Among other things, the bill sharply limited the rights of detainees in military trials, stripped habeas corpus rights from a broad swath of people "suspected" of cooperating with terrorists, and loosened restrictions on the administration's use of torture. (The Supreme Court later ruled portions of this measure unconstitutional.)
McCain's caving in to this "compromise" did it for me. This was further evidence that the former free-spirited, supposedly principled, maverick was morphing into just another panderer – to Bush and the Republican Party's conservative base.
A maverick is exposed.