It's the old Designated Villain

https://www.salon.com/2010/02/23/democrats_34/

One minute, it's Jay Rockefeller as the Prime Villain leading the way in protecting Bush surveillance programs and demanding telecom immunity; the next minute, it's Dianne Feinstein and Chuck Schumer joining hands and "breaking with their party" to ensure Michael Mukasey's confirmation as Attorney General; then it's Big Bad Joe Lieberman single-handedly blocking Medicare expansion; then it's Blanche Lincoln and Jim Webb joining with Lindsey Graham to support the de-funding of civilian trials for Terrorists; and now that they can't blame Lieberman or Ben Nelson any longer on health care (since they don't need 60 votes), Jay Rockefeller voluntarily returns to the Villain Role, stepping up to put an end to the pretend-movement among Senate Democrats to enact the public option via reconciliation.