Climate protesters disrupted an event featuring Democratic Sen. Joe Manchin of West Virginia in a video posted on social media Friday. Manchin, who announced he would not seek reelection to the Senate in November, was appearing for a “study group” at the Harvard Kennedy School Institute of Politics Friday when the protesters entered the classroom. The group, Climate Defiance, posted a 51-second video of their protest on X. “We just called Joe Manchin a sick fu*k,” the group’s post said. “We humiliated him in front of a herd of Harvard elites. He squared up. We held firm. Barbaric murderer, hid…