A former Republican congressman appeared on MSNBC on Monday night to stump for Democratic presumptive nominee Kamala Harris “the only person who can keep [Donald Trump] out of the White House. Speaking to host Jen Psaki, the former White House press secretary from 2021-22, former Tea Party Rep. Joe Walsh blasted the MAGA leader as a “horrible human being.” “He lies as he breathes. He doesn’t give a damn about anybody but himself. He’s utterly un-American. He’s a sociopath. He’s a psychopath. He’s incapable of bringing people together,” an empathic Walsh told Psaki. Want more breaking political…