A win by McCain over Huckabee in South Carolina, and by Romney over McCain in childhood-home Michigan, set up a pivotal battle in the Florida primary. Romney campaigned intensively on economic issues and the burgeoning subprime mortgage crisis, while McCain attacked Romney regarding Iraq policy and benefited from endorsements from Florida officeholders. McCain won a 5 percentage point victory on January 29. Although many Republican officials were now lining up behind McCain, Romney persisted through the nationwide Super Tuesday contests on February 5. There he won primaries or caucuses in several states, but McCain won in more and in larger-population ones. Trailing McCain in delegates by a more than two-to-one margin, Romney announced the end of his campaign on February 7.