Democratic Rep. Ron Barber of Arizona hugs his wife, Nancy, on Election Day. Mr. Barber has pulled ahead of challenger Martha McSally by almost 700 votes after the Republican led by less than 500 votes in the days immediately after the election. (Associated Press)

Democratic Rep. Ron Barber of Arizona hugs his wife, Nancy, on Election Day. Mr. Barber has pulled ahead of challenger Martha McSally by almost 700 votes after the Republican led by less than 500 votes in the days immediately after the election. (Associated Press)