Newsweek is out with a poll of likely Iowa caucusgoers (September 26-27). On the Democratic side, Obama is leading Clinton by four:

Democrats
Obama 28
Clinton 24
Edwards 22
Richardson 10
Biden 5
Undecided 9

When first and second choices are combined, Obama doubles his lead:

Obama 52
Clinton 44
Edwards 41
Richardson 19
Biden 11

Overall, Hillary Clinton's lead in the RCP Average for Iowa is down to just 2.6%.

On the Republican side, Mitt Romney holds an eight point lead, and Mike Huckabee is in double digits next Rudy and Fred:

Republicans
Romney 24
Thompson 16
Giuliani 13
Huckabee 12
McCain 9
Paul 5
Undecided 15

When first and second choices are combined, Giuliani jumps up ahead of Thompson:

Romney 45
Giuliani 34
Thompson 26
Huckabee 14
McCain 13

Overall, Romney leads in the RCP Average for Iowa by 12 points.

Other notables: 55% of likely Democratic caucusgoers say Clinton's handling of the Iraq war makes no difference to them, 21% say it'll make them less likely to vote for her while 22% say it'll make them more likely. 79% say "having Bill Clinton back in the White House would be a good thing for the country" because of his skill and experience, while only 12% say it'll be a bad thing because he might "repeat the kind of embarrassing behavior that led to his impeachment."