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Is Colorado the canary in the coal mine?

With new polls showing a GOP surge in Colorado, all eyes are on the Centennial State as a possible bellwether for control of the Senate.

Rep. Cory Gardner, R-Colo., who is challenging Sen. Mark Udall, D-Colo., for his Senate seat, speaks to reporters after meeting with the House Republican caucus on Capitol Hill in Washington, D.C., on June 24, 2014.
Rep. Cory Gardner, R-Colo., who is challenging Sen. Mark Udall, D-Colo., for his Senate seat, speaks to reporters after meeting with the House Republican caucus on Capitol Hill in Washington, D.C., on June 24, 2014.AP

Benjy Sarlin