The familiar Washington narrative on the scrum for the U.S. Senate has been rinsed, recycled and delivered once again: Republicans are primed to pick up the six seats necessary to capture control of the upper chamber. The midterm atmosphere sure looks ripe, the polling appears favorable but, as it did in 2010 and 2012, the most competitive batch of races will likely come down to candidate quality. It’s the key component that stifled GOP chances before, and could very well again. .... .... A closer look at the most competitive contests demonstrates why a Senate majority in 2014 is again...