“Sen. John Fetterman has faced a tide of public criticism from fellow Democrats as he stakes out lonely ground as a critic of the far-left wing of his party — and another wave rolled in Wednesday after he made a surprise video appearance at the Republican midterm convention,” Politico reports.“So far, however, his Senate colleagues haven’t joined the pile-on.”“Democratic senators are staying above the fray as they work to flip the majority in November amid constant speculation that the 57-year-old Pennsylvanian could trigger a nightmare scenario by leaving the party and caucusing with the GOP.”Associated Press: Fetterman’s isolation from Democrats grows stark in Pennsylvania.