David Axelrod tells "CBS This Morning" he believes voters don't yet know Santorum very well. And he declines to speculate on how tough a race the former Pennsylvania senator could give Obama.
Axelrod says when people begin to look closely at Santorum's positions, "we'll get a better idea" of how well he'll do. The former White House adviser also says the GOP race has been overcome by "negativism" and that has a "dispiriting" impact on voters.
As for the Obama re-election campaign, Axelrod says: "We don't get exhilarated by good numbers. We're not devastated by bad poll numbers. We just stick to our knitting and keep going."