Mitt Romney has won two nominating contests by spending millions of dollars, and with the help of millions more from a supportive super PAC, on television advertising. Newt Gingrich won South Carolina by pursuing the same ad-heavy strategy, to the extent his poorer campaign could.
But Rick Santorum's campaign has won four primary and caucus states in a much different manner: His campaign and its affiliated super PAC haven't spent the kinds of big bucks the others can afford.
By all accounts, Santorum's campaign should have desperately needed every penny in those three states. After coming in a distant third in Florida, Santorum sat mired in third place in national surveys; Gallup's tracking poll showed Santorum at just 16 percent between Jan. 31 and Feb. 6, six points below Gingrich and 21 points behind Romney.
But Santorum's wins this week in Minnesota, Colorado and Missouri were notable for the lack of money spent in each state.