Rand Paul's First Challenge: Defeat Ted Cruz
Both seen as conservatives just outside the mainstream of the party, Paul and Cruz will compete for support from the same voter demographic during the GOP primary, meaning that only one of these men will likely have a realistic shot at challenging establishment candidates like Jeb Bush.
"We kind of come from the same wing of the party," Paul told Fox News' Megyn Kelly on the day that Cruz announced his presidential bid, "and if you look at our voting records you'll find that we're very very similar. I guess what makes us different is probably our approach as to how we would make the party bigger."
In order to distinguish himself from Cruz, Paul has tried to portray himself as the candidate who can breathe new life into the party, arguing that "people will also have to make a decision: which is the Republican that can not only excite the base, but can also bring new people into the party."
"I'm a big fan of Rand Paul; he and I are good friends. I don't agree with him on foreign policy," Cruz said on ABC's This Week in March. "I think U.S. leadership is critical in the world, and I agree with him that we should be very reluctant to deploy military force abroad, but I think there is a vital role, just as Ronald Reagan did."
Recent polling averages show Cruz and Paul tied, with both receiving 8.7 percent support from Republican voters. At this early stage in the developing race, Bush receives 16.8
http://www.bloomberg.com/politics/articles/2015-04-07/rand-paul-s-first-challenge-defeat-ted-cruz