GOP presidential hopefuls set their sites on upcoming Iowa caucuses
NBC NATIONAL NEWS — With three and a half weeks left before the Iowa caucuses it's crunch time for the GOP presidential candidates.
Newt Gingrich is riding high in the polls and Mitt Romney is trying to bring him down with a two pronged attack - questioning his family values and his conservative credentials.
Romney visited Iowa for only the fifth time in this campaign Friday and brought his family along.
Romney is playing the family card to slam frontrunner Gingrich, who's been married three times.
In a new series of ads Romney questions Gingrich's conservatism, as well as his character.
Gingrich isn't firing back, saying he's fighting President Obama, not fellow Republicans.
He can afford to.
Gingrich is leading the polls there and in two of the three first primary states.
Gingrich, who was a bottom-tier candidate last month just had to cancel a book signing because of concerns the crowd would be too big to handle.