Kentucky's primary is Tuesday.  Louisville Courier-Journal has an op-ed in Sunday's paper that has an interesting take on McConnell's primary. He could very well come out of this primary weakened.  The poling has shown a solid tossup for months with Grimes for the general election in the fall. 

In his first real primary ever, McConnell's risk is not that he will lose, but that some percentage of Bevin voters will remain disaffected and not vote in the fall. The formula for that is a mystery, but it includes this factor: About a fourth of Kentucky Republicans have never really liked McConnell, and Bevin is the political pectin that could make those feelings jell and harden.

A secondary risk for McConnell is that he emerges from the primary looking relatively weak. That could help make Grimes look like a better investment to Democratic donors around the country and inspire more confidence among Democrats doubtful that anyone can beat the five-term senator.