Santorum was the biggest loser when he said he would surround himself with people who thought exactly like him. Diversity in ideas allows a leader to make the strongest decisions, not yes-men.
I believe Santorum was drawing a distinction between his take-charge "I know this stuff" style and Cain's fallback on his ability to gather knowledgeable advisers. I believe both were ineffectual in scoring points, due to Santorum's rigid, angry delivery when he's called to comment, and by Cain's selection of a campaign guru who keeps shooting from the lip yet keeps him onboard (it leaves me with the impression that Cain doesn't want a "let-go" Mark Block talking to the media -- but doubly, how does that give one confidence in Cain's management/leadership ability?).
I sorta think that santorum meant that if your name is hannity, do you surround yourself with colmes.