PHILADELPHIA — Standing in front of a blown-up photo of the LOVE sculpture, John Fetterman introduced himself to a crowd dotted with Eagles gear in a Northwest Philadelphia gym. “I’m ‘Jawn’ Fetterman,” he said to cheers Saturday morning. With less than 50 days until Election Day, Fetterman, the Democratic nominee for U.S. Senate, held his first public campaign event in the deeply Democratic city where turnout is vital to his party’s hopes in November’s elections. But he promised not to pander to Philly voters, saying that’s something they’d hear from Republican Senate nominee Mehmet Oz. “But i…