The Republican parties in Yuma, Navajo, Apache, and Maricopa counties filed a lawsuit against all state recorders and the secretary of state late Wednesday, as the Arizona U.S. Senate race still hangs in the balance. What is the issue? The groups are challenging how Arizona counties verify signatures on mail-in ballots that come into the polls on Election Day, according to a complaint obtained by the Arizona Republic. Arizona’s U.S. Senate race has no declared winner because it is too close to call. Results following Tuesday’s election showed that Republican Martha McSally earned 49.4 percent of the vote and Democrat...