(CNN) – There's a healthy dose of voter anger out there as folks head to the polls in a handful of primaries. Today's must-watch contests could wipe out some incumbents who are trying desperately to hang on to their jobs. That includes Arkansas, where Democratic Sen. Blanche Lincoln is locked in a tough battle against Lt. Gov. Bill Halter.
In Kentucky, Tea Party favorite Rand Paul, son of Rep. Ron Paul, is hoping to topple Sec. of State Trey Grayson, even though Grayson has the backing of the GOP establishment. And in Pennsylvania's Democratic primary, Rep. Joe Sestak is going after Sen. Arlen Specter, who was a Republican up until last year. CNN chief political correspondent Candy Crowley joined us on Tuesday's American Morning for a preview of the races.
Read more: Primaries put incumbents on line