“If you looked up ‘bipartisan’ in the dictionary, I think it would say support from Republicans and Democrats,” said Anita Dunn, a senior Biden adviser. “It doesn’t say the Republicans have to be in Congress.” As the Biden administration prepares to pursue a broad agenda ranging from infrastructure to immigration to guns, the president and his aides have proffered a definition of bipartisanship untethered from Washington — pointing to broad public support for many Democratic policies among voters in both parties, as well as Republican governors, mayors and other local officials. “Everybody said I had no bipartisan support,” Biden said recently in Pittsburgh, referring to the covid relief package as he unveiled the broad outlines of his infrastructure plan. “The overwhelming bipartisan support were Republican — registered Republican voters.” Rahm Emanuel, the former mayor of Chicago and chief of staff to former president Barack Obama, put it bluntly: “What’s become crystal clear is that Biden has redefined bipartisan.”