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Obviously, the time differs for each person. Hagel was living with and seeking voters in the more corrupt side of the equation. Probably, it took the horrors of a stupid, unjust war and sufficient casualties for him to realize the price was too high.
That the war is stupid and unjust was obvious before it ever started. I'm just Joe Sixpack with an internet connection and a cursory knowledge of history. I knew damn well that Iraq was going to turn out a disaster for the US. Schwartzkopf knew it, Ctheney knew it, anybody with a functioning brain knew it.
If a US Senator didn't know it then he had no business being dogcatcher, let alone a Senator.
Dodd, Biden, Feingold, Kucinich, Holt and others choose to try to work within it and find a way to keep from being corrupted.
Very damn few others. Entirely too few, the little Dutch boy with his finger in the dike.
Until we make much needed changes to the system, we need to identify and support those who choose to fight in an unfair battle ground and as many have previously said, support candidates who seriously believe they can change things without being corrupted.
Even in fiction the good guys don't always win. Empires always fall and the fall is seldom pretty or comfortable for those involved, particularly so for those on or near the bottom of the ladder.
And once more I point out that no one has responded to my point about Obama the candidate wishing to imprison Obama the teenager/young adult.
Until America stops making war on its own citizens then the slide to totalitarianism will continue, Obama will do nothing to halt the slide and neither will Edwards, Clinton or any other candidate who supports making war on our own people.
As for Chicken Little, he only has to be right once.