In this case, it's Colorados' own Bill Ritter, vetoing a bill that would have excused CCW permit holders from an additional background check when purchasing a firearm.
Gov. Ritter used to be the Denver DA and has probably never seen an anti-gun bill he didn't like.
As an exercise for the press, the next time he holds a presser, everyone bring a small paper bag. Inflate the bag while setting up, and when the governor assumes the podium, pop it. The betting pool should include such options as "dives behind podium", "orders state police to search all present until the assault weapon is found", and "widdles pants".