Colorado State Flag.

From the novel A Western Capitol Hill:

Senators continue arriving at their places during these preliminaries. By now, most have stationed themselves at their conjoined desks. They’ve returned to their familiar coffee mugs, candy jars, family photos, and signs saying “Go Broncos!” Back to their mini-flags of the U.S. and of Colorado—the state’s emblem: a yellow orb like a gold, shotgun pellet embedded within a bloody “c” on top of a horizontal band of white, with horizontal bands of deep blue above and below.