The latest PPP polling from Iowa:

Newt Gingrich's campaign is rapidly imploding, and Ron Paul has now taken the lead in Iowa. He's at 23% to 20% for Mitt Romney, 14% for Gingrich, 10% each for Rick Santorum, Michele Bachmann, and Rick Perry, 4% for Jon Huntsman, and 2% for Gary Johnson.

Gingrich has now seen a big drop in his Iowa standing two weeks in a row. His share of the vote has gone from 27% to 22% to 14%. And there's been a large drop in his personal favorability numbers as well from +31 (62/31) to +12 (52/40) to now -1 (46/47). Negative ads over the last few weeks have really chipped away at Gingrich's image as being a strong conservative- now only 36% of voters believe that he has 'strong principles,' while 43% think he does not.

Paul's ascendancy is a sign that perhaps campaigns do matter at least a little, in a year where there has been a lot of discussion about whether they still do in Iowa. 22% of voters think he's run the best campaign in the state compared to only 8% for Gingrich and 5% for Romney. The only other candidate to hit double digits on that question is Bachmann at 19%. Paul also leads Romney 26-5 (with Gingrich at 13%) with the 22% of voters who say it's 'very important' that a candidate spends a lot of time in Iowa. Finally Paul leads Romney 29-19 among the 26% of likely voters who have seen one of the candidates in person.