A new poll of likely Democratic Iowa caucus voters released this week by Zogby finds Senator Hillary Clinton gaining momentum in Iowa in her bid to win the Democratic nomination. Clinton’s support in Iowa increased from 16 to 24 percent in just three weeks, leaving her tied with John Edwards in the Hawkeye State. Barak Obama was the preference of 18 percent of the 500 likely Democratic caucus voters surveyed, with former Iowa Governor Tom Vilsack a distant fourth at 9 percent—falling from 16 percent in mid-January.

The pecking order of Clinton-Edwards-Obama-Vilsack in Iowa in the new Zogby poll is the same as an American Research Group poll released ten days ago, though in that poll Clinton had extended her lead over Edwards to 17 points.

Vilsack has repeatedly stated he will win his home state’s caucus next January. To do so is imperative for his campaign, as Vilsack is running very low in the national polls, well-behind not-as-yet candidate Al Gore who places fourth in most surveys.