A race in North Carolina critical to control of the U.S. Senate has been thrown into turmoil over allegations of personal misconduct by Democrat Cal Cunningham, a married man who had an extramarital relationship with a consultant. Previously undisclosed text messages obtained by The Associated Press and additional interviews show that the relationship extended beyond suggestive texts to an intimate encounter as recently as July. Cunningham’s personal indiscretion offers a fresh test of whether voters will punish candidates for their private, consensual activity, and the answer they deliver could determine which party wields power in the Senate. He is challenging Republican Sen. Thom Tillis.