Chris Christie’s old baseball pal and Port Authority appointee “is now cooperating with Paul Fishman,” Esquire reports. Wildstein “was camped at the U.S. Attorney’s office” last week in the probe of the George Washington Bridge shutdown, Main Justice adds. He and Bridge Ann Kelly, the “time for some traffic problems in Fort Lee” duo, were blamed for the closure by Christie’s version of an investigation and are now in the market for immunity in exchange for their info.