Republican Chris Fields made his official announcement to run for Minnesota's 5th Congressional District. Fields joins Lynne Torgerson in the Republican candidate pool. It will be an uphill battle for both challengers -- Ellison won with 68 percent of the vote in 2010 and with 71 percent in 2008.
Jeff Johnson shocks Pawlenty with GOP win, Tim Walz gets DFL nod
Johnson's victory was the biggest shock of the night.