Katie Porter -- the Democratic frontrunner for California governor in 2026 -- is seen losing her cool once again ... caught on camera yelling at a staffer to get out of her "f***ing shot." The newly resurfaced video, obtained by POLITICO , shows a convo between Porter -- then a member of Congress -- and former Energy Secretary Jennifer Granholm in July 2021. Check out the video ... midway through the convo, Porter snaps at a staffer who steps into frame to fact-check one of her comments about