ABC’s Dowd: If Trump Wins Iowa, ‘He’s on a Roll and the Dominoes Start to Fall’

STEPHANOPOULOS: "Our poll on Trump shows an incredible conversion. Six months ago when he got in two-thirds of the Republicans said they wouldn't support him. Now two-thirds say he'll be the nominee and say they can support him."
ROBERTS: "Big change, and you know who was saying it all along? Matthew Dowd and he will join us from home in Austin, Texas. And you heard Donald Trump there with George sounding very confident yet again. The poll numbers as George was alluding to-- and I believe back in August, you were saying this was his nomination to lose."
DOWD: "Yeah, he's got double-digit leads nationally. He's got a double digits lead in all of the key states coming up and I think Donald Trump has an opportunity to do something no GOP candidate for president who was an incumbent has ever done which is win Iowa and New Hampshire. No GOP candidate has ever done that who wasn't an incumbent president. If he wins Iowa he's on a roll and I think the dominoes start to fall."