I've heard mixed reviews about this from faculty. Generally speaking, they don't include any personal contributions to political parties in their CVs, though they too may have dedicated significant amount of time to the organizations. My girlfriend had a similar problem, but with liberal organizations, she kept it out of her CV but spoke about the leadership skills that she developed from her work with "political organizations on and off campus" and how it contributed to her success in other ventures. She also used the club advisor, who was also a professor of hers, as a reference. My point being, thought we like to think that they will look beyond that we cannot know for certain, and at the end of the day its up to you. However, there are ways you can include it without straight out writing it on your CV.