let's talk a little bit more about the changes, particularly in ben carson's campaign. i'm joined now by larry sabido. happy new year! >> happy new year, fred. >> so what do you think? new campaign manager, communications director, what does this mean to you for ben carson? >> fred, it's never a good thing when a campaign has a shake up, and especially when the shake up comes with the month to go before iowa. you do not shake up a winning campaign. that just doesn't happen, at least not very often. so, frankly, campaigns are a lot about luck. they're about the man beating the moment or the candidate meeting the moment. and unfortunately for ben carson, the focus of the campaign has shifted from domestic issues where he's strong, to national security issues, where he's week. >> hmm. the campaign's use of the word "invigorat "invigorate,," this is about invigorating the campaign. when i spoke with the new campaign manager yesterday, he