Ted Cruz, staring at hundreds of thousands of dollars in negative advertisements against him in Iowa that show only signs of growing, is battling to keep pace there with his most aggressive push yet to maintain his momentum in the Hawkeye State. On Wednesday, the day that a fourth and fifth independent group launched paid media campaigns attacking Cruz as out of touch with Iowa Republicans, Cruz's campaign sent word that he will launch a 36-county, six-day tour right after the new year, his most extensive trip of the state so far. Cruz is expected to spend much of January...