http://www.univision.com/content/channel.jhtml?chid=3&schid=10414
On the front page it's called "Foro Republicano". The debate is Sunday the 9th (tomorrow) at 7pm EST. If you want a translation you can go to yahoo or google and they have translation pages where you can enter the above address and it will translate the entire page. Not very well...but well enough.
The link I provided also appears to have a link to watch the debat live online. So, if you don’t have Univision, you can watch it at the link above.