WASHINGTON - Illinois Gov. JB Pritzker acknowledged his rapid weight loss, joked about former Chicago Mayor Rahm Emanuel — another 2028 presidential hopeful — and thanked the press during a speech before Washington journalists and dignitaries on Saturday.“I'm JB Pritzker, governor of the great state of Illinois, and if you're seeing me in person for the very first time, yes, I'm the gov who put 'gov' in Wegovy,” Pritzker said, referring to the p…