The top Democratic presidential hopefuls getting ready to rumble tonight in their 3rd debate in Houston. This marks the first time the candidates will be taking one stage on one night, so you can expect plenty of fireworks. But Nova Southeastern University's Charles Zeldon says the candidates need to be careful, one mistake could cost them. To qualify, the candidates needed 2-percent in at least 4 approved polls and 130-thousand unique donors. The qualifications are exactly the same for the 4th debate in October, so all of the candidates are automatically in plus billionaire Tom Steyer who just qualified. WIOD will carry a pre-debate special hosted by Ryan Gorman from 6 to 8 tonight, followed by the debate live until 11 p.m.