Arizona Gov. Jan Brewer Saturday endorsed Colorado Lt. Gov. Jane Norton in Norton’s Senate GOP bid, perhaps signaling growing demand for Brewer’s endorsement of conservative candidates outside of her state that focus on curbing illegal immigration.

Brewer praised Norton as “a conservative, a fighter, and a leader in the push to secure our borders.” She said Norton will fight President Obama’s “heavy-handed and unconstitutional attempt to block Arizona’s landmark immigration law.” She also “supports the rights of states like Arizona and Colorado to do what the federal government hasn’t — fight back against illegal immigration,” Brewer said.

Brewer’s star has been on the rise in conservative circles ever since signing in April the nation’s toughest immigration policy, including making it a misdemeanor for a non-U.S. citizen to be in Arizona without carrying federally required registration documents and stiffening penalties for those sheltering, hiring and transporting illegal immigrants.

Norton has been running a close second in recent polling for the Republican nomination to battle Sen. Michael Bennet (D-Colo.).