When Edward Kennedy bestowed his blessing on Barack Obama at a thunderous rally in Washington, he had only sweet words about Obama's chief rival for the Democratic nomination—at least when he mentioned Hillary Clinton by name. But it was hard to miss what the senior member of one of the U.S.'s most storied Democratic clans was really saying about the political style of another dynastic family. Obama, Kennedy declared, "has given America a different kind of campaign—a campaign not just about himself but about all of us."
In many ways, the Democratic race has become a referendum on Clintonism and the...