A Democratic state lawmaker says he may consider challenging U.S. Rep. Jim Matheson for the party's nomination after Matheson voted against sweeping health care legislation that is at the top of President Barack Obama's domestic agenda.

State Sen. Scott McCoy of Salt Lake City says he and other Democratic activists are frustrated with Matheson for voting with Republicans on the health care bill. Matheson says he voted against the bill because it is too expensive.

McCoy is one of the most liberal members of the Legislature, while Matheson is a moderate who is known for frequently siding with Republicans.

Matheson is seeking a sixth term in 2010. So far, no Democrats or Republicans have filed to run against him.