A new CNN/ORC survey in Iowa finds Joni Ernst (R) leading Bruce Braley (D) in the U.S. Senate race by two points, 49% to 47%. A new Rasmussen survey has Ernst ahead by one point, 48% to 47%.A new Fox News poll also has Ernst ahead by one point, 45% to 44%.A new Des Moines Register poll will be released on Saturday night.