John Kerry (D-Mass.) is vetting the leading candidates to be the next Democratic National Committee (DNC) chairman, and asking them to remain neutral in the presidential selection process in 2008. It is the latest indication that Kerry is putting down markers to run again for the party’s presidential nomination in 2008. His outreach to DNC candidates also marks his return to the fray after Iowa Gov. Tom Vilsack, that candidate he was backing for chairman, ruled himself out of contention in November. The DNC contest is exposing the presidential ambitions of a number of Democratic politicians. In addition to Kerry,...