"Ben Carson Addresses Cruz Tactics in Iowa: 'By Their Fruit You Will Know Them'" - Breitbart

"He confirmed that he thinks Cruz's tactics affected his
caucus results in Iowa. pointing out that he got a lot
of "intelligence" on the ground that suggested that he
would do better than expected..."

http://www.breitbart.com/big-government/2016/02/03/ben-carson-i-spoke-with-ted-cruz-about-dirty-campaign-tactics/