Another Clinton superdelegate, New Jersey Gov. Jon Corzine, talks about switching his vote

All that talk from the Clinton campaign about superdelegates having the right to vote for whomever they want is catching on, but not the way the Clinton campaign wants according to this report on First Read:

Per NBC’s Tom Winter, Gov. Jon Corzine, a Clinton superdelegate, just said on CNBC's Squawk Box that he reserves the right to change his vote from Hillary Clinton if she doesn't have the popular vote. He stopped short of saying that he definitely would change his vote if she lost the popular vote and he did strongly emphasize that Sen. Clinton would win the popular vote in the end.

Sen. Maria Cantwell, another Clinton super, has said similar things regarding the popular vote.

Cantwell made her statement late last month:

“If we have a candidate who has the most delegates and the most states,” the Democratic party should come together around that candidate, Cantwell said. The pledged delegate count will be the most important factor, she said, because that is the basis of the nominating process.

UPDATE: Sam Stein has an interview with another Clinton superdelegate, Rep. John Murtha, that seems to veer from the Clinton messaging, too:

Hillary Clinton simply cannot be the Democratic nominee if she doesn't win the popular vote, Pennsylvania congressman and Clinton-backer John Murtha said Wednesday.

"Clinton has to win Pennsylvania," he argued in an interview. "She has to be ahead in the popular vote to have any chance at all of getting this nomination."

Murtha declined to speculate on how the rest of the primary would play out. But during a wide-ranging interview he offered takes on many aspects of the primary race that put him at odds with his chosen candidate.