You'll get differing opinions about the propriety of speaking ill of the dead. In the case of the recently departed senator from Massachusetts, it's especially problematic. I do know this much: what my friend Leo Pusateri posted on his blog was hardly vicious. The reaction he got? Well, it seems a little over the top (note: link NSFW).
I am amused that a guy who blogs at a site that has trouble getting through a post without letting an F-bomb fly would attempt to use the Joseph Welch quote as a truncheon against Leo, though.