“Will the nuclear option appear in TV ads next year? No. But it’s another bullet questioning their credibility,” says National Republican Senatorial Committee spokesman Brad Dayspring.

“It’s a tad bit insidery. But that being said these are red state Democrats and it’s not hard to make the case they’re further empowering an agenda most voters oppose.”

Dayspring and other Republicans think the filibuster is another issue that can be used to tie red-state Democrats to President Obama, a chief theme for the GOP in 2014…

“It’s going to enable Obama to pack the circuit court with judges that pass his coal regulations. For Grimes, destroying the filibuster means hurting the Kentucky coal industry in a tangible way,” he says. “That’s where an abstract procedural issue turns into a real local issue that has a concrete impact.”