The special election to replace Rep. John Murtha (D-Pa.) will be May 18 — the same day as Pennsylvania’s primary election. Gov. Ed Rendell (D) announced the special election date Wednesday, saying it will save money to hold the two elections concurrently. The move could also help Rendell’s party, though, because Democrats will be holding competitive governor and Senate primaries that day, while the Republican primaries in those races are decidedly less interesting.