Dick Morris and  Eileen McGann

The Iowa caucuses mean different things to different candidates. Of course Obama, Clinton and Edwards, for the Democrats, and Huckabee and Romney, for the Republicans, are vying for a win in Iowa. But there are separate sub-primaries going on as well: Obama v Edwards for the position of chief challenger to Clinton, McCain v Giuliani for the right to wear the “moderate” Republican mantle, and Fred Thompson v Oblivion for the right to stay in the race. So here’s the scorecard to use in keeping track of what each candidate needs to get from Iowa.

Hillary Clinton

If she scores a decisive triumph, the race for the nomination is almost over. A victory here would likely propel her to a win in New Hampshire and the nomination would be hers’. But she doesn’t need to win. Her national base is so strong that she just has to stop anyone else from winning. If no clear winner emerges, but the results show, instead, a three-way tie with Obama and Edwards, or a two-way tie between herself and either of her challengers, she comes out the winner. But if she clearly loses by a good margin or finishes third, she has blown a major opportunity and is in for a long cold winter of primaries. She won’t be knocked out in Iowa no matter what, but she could be knocked down.

Barack Obama

He’s got to win in Iowa. He is so far behind Hillary in the national standings that he needs a decisive victory to give him the momentum to prevail in New Hampshire and to compete in Florida and on Super Tuesday. He also needs to leave the pesky John Edwards far behind so he can consolidate the anti-Hillary vote behind his candidacy.

John Edwards

His immediate need is to finish close to or ahead of Obama so he can show that a vote for him is not wasted. With pro and anti Hillary sentiment so strong, Edwards risks being excluded as an also ran if he doesn’t make it. He also needs Hillary not to win decisively so that the race stays alive. He has a decent shot in New Hampshire if he can stay in the race and make sure there still is one.

Mike Huckabee

Win or die are his choices. The Huck-a-boom will be right in the ancient history books with the Howard Dean surge in September of 2004. But even if Huckabee wins in Iowa, he’ll probably lose in New Hampshire. Then his candidacy will come back to another game-set-match point in Michigan the following week.

Mitt Romney

Dick Morris and Eileen McGann

Dick Morris, a former political adviser to Sen. Trent Lott (R-Miss.) and President Bill Clinton, is the author of 2010: Take Back America. To get all of Dick Morris’s and Eileen McGann’s columns for free by email, go to www.dickmorris.com