Overall, I think this debate helped Paul, but only slightly.
Romney is a bunch of points behind, and I think this either hurt him slightly or had no effect.
Newt got ripped to shreds. He's one point ahead in Iowa, but he got completely attacked from all sides, and all of his rebuttals were completely destroyed. He got called out on flip-flopping, lobbying, etc.
Ron Paul did well (not amazing, but good) on his own responses, amazing in his attacks on Newt, and defended himself against the Iran accusations the first two times well enough, but in between Bachmann interrupting and the moderator criticizing him for not answering within the time limit (which not one candidate HAD done), I don't think he was able to effectively get 100% of his message across to the neocon voters. It could have also helped to mention the troop donations and such.
We're going to need to phone from home around the clock to win this for sure.