Could the Democratic House Member from Illinois with by far the best known name go down to defeat Tuesday night? Could the once-promising career of Jesse Jackson, Jr. be finished—at the hands of fellow Democrats, no less? Along with the Republican presidential primary, one of the biggest political stories of March 20 will certainly be the fate of the young Jackson, who faces a strong primary challenge from former Rep. Debbie Halvorson (lifetime American Conservative Union rating: 20 percent), who lost her Will County-based seat two years ago to Republican Adam Kinzinger. The race between the former congresswoman and the...