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Washington • The debates are done. The last corn dog has been consumed. The last Iowa pork chop has been praised. Now it's time for Iowa voters to cast their votes.

Make that: It's time for about 5 percent of Iowa voters to go to their caucuses.

Tonight's caucuses could reshape the Republican presidential field, giving new life to some campaigns and closing the book on others.

Here are seven factors that will determine the Iowa results:

Weather • Bad weather helps the candidates with the most dedicated followers. That means you, Ron Paul. The chief beneficiary of a nice, crisp Iowa night would be Mitt Romney, who has the greatest breadth of support, according to polls by the Des Moines Register and Public Policy Polling, but who doesn't have the enthusiasm factor.

Get-out-the-vote skills

Iowa insiders say that Ron Paul, Rick Perry and Michele Bachmann have the best organizations in the state. Turning out your voters could help boost caucus performance by several percentage points. For Perry, it could be the difference between fifth and third. For Paul, that could be the difference between third and first.

"Paul's unique appeal could confound some of the usual patterns about who turns out for these contests," said Tom Jensen, president of Public Policy Polling. "But if it doesn't Romney or Santorum could come out on top. It looks like it's going to be a photo finish."

Momentum • Four years ago, Barack Obama and Mike Huckabee carried lots of momentum into caucus night. When the results were tallied, they shocked the early favorites, Hillary Clinton and Mitt Romney. This year's candidate with Big Mo is Rick Santorum, who has soared from single digits into contention for the lead. Will his momentum continue through the caucus? We'll see soon enough.

Last-minute attacks • Rick Perry's spending big to blunt Rick Santorum's momentum. He's calling him a "serial pork-barrel earmarker" who's not a "movement conservative" and was rejected by Pennsylvania voters "in a landslide." Unlike former frontrunner Newt Gingrich, who did not retaliated when Perry and others lambasted his record, Santorum has responded aggressively, noting that Perry pays for Texas to have a state lobbying operation in Washington and has been liberal in requesting federal money.

Can money buy happiness? Rick Perry hopes so. He's reportedly spent more than $4 million to overcome campaign missteps and debate gaffes. He's spent far more than any other candidate, and his SuperPAC has chipped in mountains more. Thus far, it's not buying the Texas governor much more support than financially challenged Minnesota Rep. Michele Bachmann.

Recycled controversies • The Ron Paul newsletter controversy isn't news to Texans, who over the past 15 years have seen numerous stories about the racially charged writings. But they've been a sensation in the national media after the New York Times "discovered" them several weeks ago. Will these newsletters matter in Muscatine as much as they do in Manhattan?

Whither the Christian conservatives? Four years ago, Evangelical and born-again Christians overwhelmingly favored minister-turned-politician Mike Huckabee, boosting him to a come-from-behind victory. But the final PPP survey showed a splintered Religious Right, although Santorum is coming on strong, with 24 percent to 16 percent for Gingrich, and 15 percent for Paul and Romney among self-described Evangelicals. Bachmann and Perry were at the back of the pack. If Santorum picks up last-minute support from Perry, Gingrich or Bachmann, it could cap a miracle comeback.