i'm alex witt. a new poll shows mitt romney has a lead among hispanic republicans in florida. the abc news poll shows 35% would vote for romney. 21% would say gingrich is their choice. santorum received % and ron paul received 6%. they make up 10% of the republicans likely to vote in tuesday's primary. for all of this and our political coverage, but for now we'll take you to the d documentary mystery "double lives." for a year and a half medical city hospital in dallas, texas, has been home to conjoined twins ahmed and mohamed. it's june 2002 when they arrive from cairo with a dedicated medical team. here in dallas doctors not only question how to separate the twins without sacrificing one for the other, but they also must face the ethical question. should they? is it really the right thing to