Pressed by moderator Margaret Brennan during Tuesday night’s vice presidential debate, Gov. Tim Walz (D-MN) admitted he misspoke about where he traveled to during the Tiananmen protests, even suggesting, “I’m a knucklehead at times.” “I have poured my heart into my community, I’ve tried to do the best I can, but I’ve not been perfect and I’m a knucklehead at times,” he told Brennan, moderator of “Face The Nation” and a chief foreign affairs correspondent. He then launched into a longwinded description of his early life in rural Nebraska in “a town you rode your bike with your buddies until the…