Two Knox County legislators have joined House Republican Caucus Chairman Glen Casada in signing up as supporters of a lawsuit trying to force President Barack Obama to turn over a copy of his birth certificate. State Reps. Stacey Campfield of Knoxville and Frank Niceley of Strawberry Plains say they agreed to be listed as plaintiffs in hopes of resolving contentions that Obama may actually have been born outside of the United States, which would mean he cannot serve as president under a provision of the U.S. Constitution. Casada and Rep. Eric Swafford, R-Pikeville, also acknowledged that they will back the...