Tonight is primary night – when Republicans can stop aiming at each other and start launching attacks across the aisle.  Obviously, the biggest race to watch tonight will be the Republican gubernatorial primary, but there are others that could prove interesting as well, particularly with the Colorado Senate up for grabs.  Here are our suggestions for races to watch:

Republican Gubernatorial Primary

This race has been full of twists and turns from the beginning, and tonight may be no different.  Most spectators have predicted that the race would come down to the former Congressmen Tom Tancredo and Bob Beauprez.  Tancredo most recently said that he was behind in the polls, which could bode well for Beauprez.  But, given the unpredictable nature of this race, tonight’s results could be a surprise.

Republican CD-4 Primary

U.S. Rep. Cory Gardner’s decision to jump into the U.S. Senate race against incumbent Sen. Mark Udall left a vacancy in his old seat, a reliably Republican seat.  Weld County District Attorney Ken Buck threw his hat into the race as did three others: Weld County Commissioner Barbara Kirkmeyer, former Cranston Rhode Island Mayor Steve Laffey, and State Sen. Scott Renfroe.  Buck has the backing of some big names, including Gardner, but so, too, does Laffey, who sports the endorsement of 9-9-9 Presidential candidate Herman Cain. It’s worth noting that Renfroe has the support of Dudley Brown and RMGO, who can be helpful for primary candidates.

Republican CD-5 Primary

In a seat as staunchly conservative as CD-5, U.S. Rep. Doug Lamborn likely has it locked up.  But, this isn’t the first time retired U.S. Air Force General Bentley Rayburn has run against Lamborn.  The two squared off when former U.S. Rep. Joel Hefley retired in 2006 and, again, in 2008.  Maybe third time’s the charm, but most expect Lamborn to win.

Lang Sias vs. Laura Woods in Senate District 19

Lang Sias came up just short last election against Evie Hudak, who resigned her Senate seat under threat of recall.  RMGO-backed Laura Woods, also known as Laura Waters, is challenging Sias from the right.  Woods attracted greater support at the assembly, but Sias is a formidable opponent.

Mario Nicolais vs. Tony Sanchez in Senate District 22

Mario Nicolais is well-known in the district and well-liked, but Tony Sanchez has the backing of RMGO, which often pushes candidates through the primary.  We have heard that Nicolais has been pounding the pavement, which should work in his favor.

What are your predictions, PeakNation™?