The Vote Staying positive may have cost Newt Gingrich Iowa. Will he change strategy?

Former front-runner Newt Gingrich has fallen behind going into the Iowa caucuses Tuesday, polls show. The reversal means Gingrich might change course in the days ahead.

Evan Vucci/AP

Throughout his campaign, Newt Gingrich has had one consistent message: Stay positive. And he's seeing how well that's working out.