Republican Sen. Deb Fischer of Nebraska, a two-term incumbent who won previous Senate races by at least 14-point margins, is in a race too close for comfort with just 18 days to election night. According to FiveThirtyEight polling averages, Fischer holds just a one-point lead over Dan Osborn, an independent candidate who has never held public office. This makes the Nebraska contest the closest race in the country in terms of polling. “This race should not be close,” Randy Adkins, University of Nebraska Omaha political science professor, told the Daily Caller News Foundation in an interview. “S…