In a tough year for Senate campaigns, Democrats will take everything they can get. This year's map of Senate races heavily favors the GOP, which will defend only 10 seats to Democrats' 23. Six Democratic incumbents have declined to run, and Democrats will have to defend seats in 11 competitive races, while Republicans will only defend in five. All of which makes Sen. Dick Lugar's loss welcome news for Democrats, who seem to have figured all along that their candidate, Blue Dog Rep. Joe Donnelly, would fare better against Tea Party-backed, Saran Palin-endorsed state Treasurer Richard Mourdock in November. Now...