The latest polling data in key battleground states shows a Republican midterm edge for winning control of the U.S. Senate. In Arkansas, Democrat incumbent Mark Pryor is slightly behind his challenger, Rep. Tom Cotton. In Alaska, incumbent Democrat Mark Begich was doing well until he ran an inflammatory ad against Dan Sullivan which caused such an outrage that the Begich campaign had to withdraw it. In other states with incumbent Democrat senators, like West Virginia and South Dakota, the GOP has a distinct lead in those races. North Carolina may turn out to be a nail-biter, as well as states like Michigan where the Democrats thought they would have a certain victory. Currently, based on polling numbers, the GOP looks to win at least 51 senate seats and possibly 53 to 55. Between 5 to 6 states are so close that results may not be able to call a winner on election night.