Alaska Lt. Gov. Mead Treadwell will announce Tuesday that he's challenging freshman Sen. Mark Begich (D) in 2014, The National Journal reported.
A Democratic source told "The Hotline" that Treadwell called Begich to inform him in advance about the announcement. Begich beat longtime Sen. Ted Stevens (R) in a tight 2008 race.
Treadwell will face Joe Miller, the activist who beat out incumbent Sen. Lisa Murkowski in the 2010 GOP primary, in the red state's general election primary.