If the continuing tug of war in Washington is predictable, the outcome of the presidential nominating contests is more of a roller coaster than ever. In fact, senior strategists for both parties are now sensing that those nominations won't be decided as early as they thought. The recent surges by Democrat Barack Obama and Republican Mike Huckabee in Iowa, where each has moved up to compete for the lead, are signs that voters aren't close to settling on their standard-bearers. Neither of the national front-runners, Hillary Clinton and Rudy Giuliani, has "sealed the deal," Democratic pollster Geoff Garin says. This uncertainty may prolong the process well beyond the February 5 megaprimaries that everyone thought would be the finale.