Wow. It's very hard to debate a topic with rhetorical questions that are solidified with a foundation of logical fallacies.
Assumptions you make in your post that your questions rely on:
1. Cheney and Co. are "leaders of conservatism"
2. Conservatism is dying in America
3. Cheney is the "darling of the conservative movement"
4. The GOP is conservative
All three of these are unfounded.
All that having been said I'll attempt to answer the "questions."
QUOTE
1. Does the Libby case discredit the conservative movement, showing it has no commitment to truth, but only cynical politics at any cost.
No, it discredits Scooter Libby...You know, the guy on trial.
QUOTE
2. Is the party of conservatism, the GOP, on its way to disappearing from history, like the Whigs, as their leaders are tainted with scandal, criminal convictions, and failed policies.
The Republican Party is not conservative so it's hard to answer this question. That said, no, the Republican Party is not dissapearing any time soon, there's no reason to believe such a thing and there is even LESS reason in believing that the Libby trial shows the failures of conservatism or the GOP's imminent destruction.
CP