Iowa Sen. Ernst in tough reelection race against Greenfield

DES MOINES, Iowa (AP) — Six years after Iowa voters overwhelmingly elected her to the U.S. Senate, Republican Joni Ernst faces a tough challenge from Democrat Theresa Greenfield in a race that has been one of the most expensive in the nation. The two candidates had more than $170 million for spending on media as parties and interest groups poured money into the race, which was eyed as a key battleground for control of the Senate. Ernst breezed into office in 2014...