A new Des Moines Register poll of likely Republican voters in Iowa shows Sarah Palin's favorability rating has slipped a bit in the state since November 2009.
65% view her "mostly" or "very" favorably, while 30% look on her "mostly" or "very" unfavorably.
In November 2009, those numbers stood at 71%/23%.
Even though that's a statistically significant drop, I don't think it's dramatic enough to cause Team Palin much concern.
It's also tough to draw a link between her ebbing popularity and apparent lack of interest in doing legwork in the state -- even though Iowa voters are notoriously demanding of their candidates. It's just not that big a slip.