Democratic Sen. John Fetterman of Pennsylvania tore into members of his own party Thursday over recent criticism of President Joe Biden’s age and job performance. Fetterman even went as far as to suggest that Democrats who are willing to publicly call out Biden’s shortfalls should buy “Make America Great Again” hats — which were a trademark of then-candidate Donald Trump’s winning 2016 campaign. On Thursday’s edition of “Morning Joe” on MSNBC, the senator said he firmly believes Biden will not only win his home state, but will also win another term in November, The Hill reported. “The preside…