The best result for the U.S./U.K. coalition of the willing would be losses by the LibDems to Conservatives, but Labour keeping a comfortable enough margin to secure Tony Blair as PM. That will negate Iraq from the next election.
Iraq won't be an issue in the next election unless something really bizzare occurs. Blair is winning this election despite Iraq. In fact, Labour is winning this election despite Blair.
The guys at National Review are hoping for a win by the Conservatives. They see Blair's Eurocentrism as a liability that outweighs his support for the war at this point.
You say that because you don't have to live in UK. We Americans who do want a Tory win.