Obsidian Wings speculates that Gen. Petreaus may have ruined his chances of being a future GOP presidential nominee by coming out against former VP Cheney's pro-torture remarks.
Unlike some KOS folks, I don't find it at all surprising that Petreaus is against torture. You'd be hard pressed to find a senior US officer who believes otherwise.
But if it turns out to be true that the GOP will have a pro-torture litmus test in the future, then that party is in much more danger than I thought. It will indeed spend a very long time in the wilderness in that case, because Americans will not support a pro-torture party.