Des Moines Register: Iowa state Sen. Sarah Trone Garriott plans to move to Dallas County to avoid a primary matchup with another Democratic incumbent — a move that sets up a possible electoral showdown next year with the Republican senate president. Trone Garriott, D-Windsor Heights, planned to officially announce her reelection plans Wednesday morning. She is among several Iowa legislators mulling whether to move, run in a primary or retire after Gov. Kim Reynolds signed a new set of redistricting maps into law that groups dozens of incumbents into the same districts.