Hill becomes the 3rd republican to drop out of the Senate race after Gardner announces run
Colorado's Senate seat could be the key to which party controls Congress next year.
Colorado lawmakers are concerned with a provision in the bipartisan budget agreement that would cost the state money for mineral development.
Cory Gardner at a recent campaign event. [Photo: KUNC/Nathan Heffel]
[This story was produced and reported by Nathan Heffel, KUNC.]