By ANITA SNOW, Associated Press PHOENIX (AP) — With anti-immigrant rhetoric bubbling over in the leadup to this year’s critical midterm elections, about 1 in 3 U.S. adults believes an effort is underway to replace U.S.-born Americans with immigrants for electoral gains. About 3 in 10 also worry that more immigration is causing U.S.-born Americans to lose their economic, political and cultural influence,