The latest TV ad by Mayors Against Illegal Guns, the gun control group funded by Mayor Mike Bloomberg, hit the airwaves in Nevada this week, ahead of a close vote Wednesday on a background check bill that passed the state Senate.

The bill would close the loophole that allows private sales to be made without checking the criminal background of the purchaser. It also bans people deemed mentally ill and likely to harm someone from possessing a gun. The bill can be followed on Scout, Sunlight's tool for tracking the progress of state and federal legislation.

The bill passed ...