Republican presidential candidate Donald Trump calls on supporters in Miami to take a pledge to vote, saying ''If we win Florida...it's over.'' Rough Cut (no reporter narration).
ROUGH CUT (NO REPORTER NARRATION) STORY: Republican presidential candidate Donald Trump called on supporters in Miami, Florida to take a pledge that they will vote, saying "If we win Florida, believe me, it's over." Trump, the brash New York billionaire who has opened a substantial lead in delegates over presidential rivals, hopes to rack up more wins in Republican contests in Kansas, Kentucky, Louisiana and Maine on Saturday. Polling has been scarce in all four states, which together account for just 155 delegates, and the contests are open only to registered Republicans. The exclusion of the independent voters who have helped Trump's surge adds an air of uncertainty to the latest round of state-by-state contests to pick nominees for the Nov. 8 election to succeed President Barack Obama. Since winning seven of 11 contests on Super Tuesday, Trump has come under withering fire from a Republican establishment worried he will lead the party to a resounding defeat in November's election. Mainstream Republicans have blanched at Trump's calls to build a wall on the border with Mexico, round up and deport 11 million undocumented immigrants and temporarily bar all Muslims from entering the United States.