Transcript for Can Marco Rubio and Ted Cruz Catch Up to Donald Trump on Super Tuesday?
I want to bring this to Jon Karl and, Jon, looking ahead to tomorrow night, big contest. Give people a sense of what Marco Rubio and Ted Cruz need to do to kind of slow down Donald Trump. Well, George, they've got to keep him from running away from it. For Ted Cruz, everything is at stake because look at this. His home state votes on super Tuesday. He's got to win there. If he can get 50% of the vote there he can get away with the lion's share of the delegates but he has to do more. All these southern states, that is where Ted Cruz has banked his campaign. He's got to find a way to win there. As for Marco Rubio, it's unclear where he can win. He's been targeting Minnesota, Virginia, Arkansas, he can keep getting delegates by coming in a close second or third, but he's got to find a place to win. I think 20% is his biggest number, 20% in Texas if he gets less than that he can get shut out of all of Texas' delegate. They have to build up enough delegates to try to block trump even if they can't get there themselves. On the democratic side Hillary Clinton coming out of that big win Saturday in South Carolina. Looks like she's ready to roll through the south. That's right and Bernie sanders has to find a way to win somewhere where we don't expect him to. His home state votes, he can win there. Probably Massachusetts next door but he's got to find a way not to Geddes mated again in the south. Okay, Jon Karl, thanks very much. We're going to be out in force on super Tuesday. I'll be with our whole political team for a prime time show and on "Gma" and "World news
This transcript has been automatically generated and may not be 100% accurate.