truth. we need strong energy. i am talking about ben. i am talking jeb because i thought he was going to be the front-runner. obviously he's not going to be, i'm not going to talk about hitch so much anymore. >> reporter: the interesting thing is ben carson said he will not return fire. not the same from marco rubio. trump was in the state of florida over the weekend. rubio started attacking trump. we'll have more on that later. still, polls show that right now, donald trump is believed to be the best candidate for the white house by 7 of 10 republican voters. more on that later in the program. back to you michaela. >> thanks to you, joe. our vice president joe biden opening up about why he decided to jump into the race. he said, simply, he knew he couldn't win. he addressed bo's dying wish for him to run.