Gingrich doing well on Intrade means very little. And all the polls reflect is who the people perceive to be the front runner. In every case of a candidates rise to take the lead from Romney, they were pumped by the media and like a hive mind people just accept them as front runner without really thinking or choosing that candidate.
Likewise, being constantly bombarded with unelectable for YEARS has got people believing Ron Paul doesn't have a chance. So this is the reason I don't think he polls well in national GOP. The encouraging thing though is if the voters can be reached on a more individual basis like in Iowa and New Hampshire, the media lies are exposed.
I think a win in Iowa and especially one by a BIG margin so that there can be no question of his popularity. Will propel Ron into one of the main candidates if not the Front runner and people who have dismissed him through media bias will come and take another look at Ron. A top 2 finish in New Hampshire would then solidify that support and boost it further especially if it's Ron and Romney out in front.