By the numbers, West Virginia’s 3rd District looks like a prime Republican takeover opportunity. Former Massachusetts Gov. Mitt Romney won the district with 65 percent in 2012. Sen. John McCain, R-Ariz., won it with 56 percent in 2008. And President George W. Bush took 53 percent in 2004. But winning the southern West Virginia seat — and defeating Democratic Rep. Nick J. Rahall II — has been impossible so far for the GOP. (more…)