A friend forwarded to me the latest (to me, at least) in slime techniques from the right--an attempt to use Chappaquiddick against Kerry. A quote from the e-mail:
"It is time for the GOP, and all Democrats over the age of 40, to stand up and remind America why Sen. Kerry's chief spokesman had to abandon his own presidential bid in 1980. It is time to say the words "Mary Jo Kopechne" out loud. "
FWIW, there's a false rumor about Rumsfeld making a veiled Chapaquiddick reference in defense of the administration's WMD fiasco, debunked at http://www.snopes.com/politics/satire/kennedy.asp