The Colbert rapport (or lack thereof)

In all the back-and-forth about Stephen Colbert's appearance at the White House Correspondents' Dinner, why hasn't anyone made the obvious comparison to his former colleague Jon Stewart's appearance on "Crossfire"?

Both appearances were less than knee-slapping hilarious, yet both were terrific examples of speaking truth (or "truthiness") to power. Both demonstrated courage (OK, not getting-your-ass-shot-off-in-Iraq courage, but still) that was remarkable mainly for how unusual it was to see even such a small amount of courage and real truth-telling in the public discourse today.