Former President Donald Trump severely hobbled his chances at the debate in Philadelphia by choosing unserious people to prep him for the debate, including Florida Rep. Matt Gaetz and former Hawaii Rep. Tulsi Gabbard, prominent liberal podcaster Tommy Vietor told MSNBC’s “The ReidOut” on Wednesday evening. Trump’s performance, which even Republicans regarded as a “trainwreck,” saw him struggling to answer basic questions, growing visibly agitated with Vice President Kamala Harris as she attacked his record, and promoting an internet hoax about Haitian migrants eating pets. “Tommy, Trump has be…