By JONATHAN J. COOPER | Associated Press

SALEM, Ore. (AP) — With Oregon Democrats moving forward on a bill to require background checks for private gun sales, the potential political backlash is becoming apparent.

Gun rights advocates last week filed petitions to recall three Democratic lawmakers who sponsored the legislation, and they say more could follow.

It's not yet clear whether deep-pocketed gun interests like the National Rifle Association will get involved and raise a serious threat to the targeted lawmakers.

The state Senate voted last week to require background checks on any person-to-person gun sale not involving relatives.

The recall move puts pressure on Democrats as the bill awaits a hearing in the House.