. >> republican presidential candidates will square off in an important debate. kathleen walter has a look in miami with what to expect tonight. the debate is under way at 8:30 this evening at the university of miami. it is a crucial night for the candidates. >> the stage is set for a showdown in florida. >> >>. >> senators cruz. >> more than 2000 supporters are expected to turn out for the cnn debate, hoping their candidate has a strong showing. >> exciting day. you see the momentum on our side. >> and it is the last debate before voters in florida, ohio and three other states head to the polls. a new suffolk university poll, has donald leading, with 33 percent of the vote, followed by florida senator, marco rubio with 37 percent. followed by ohio governor at watching. >> thankfully, will thinking every day. he's number one in the common key states we're looking at in terms of google search. florida, ohio. the winners take the states coming up each week. he's the most searched. >> the stakes are high for marco rubio. the debate is a chance to salvage his faultering campaign. for esta