The endorsement from the top Republicans came hours after McCain's camp released a memo saying it's "mathematically impossible for Gov. Huckabee to secure the Republican nomination for president." Former Arkansas Gov. Mike Huckabee is McCain's last remaining competitor for the nomination.

Rep. Roy Blunt, the Republican whip, declared the race over and said McCain would be the best person to help Republicans take back the House.

McCain has 827 delegates to Huckabee's 217, according to CNN calculations. A candidate needs 1,191 to become the Republican nominee.

According to the memo released by McCain's camp, Huckabee would need to win more delegates than remain in the future contests to reach the threshold.

http://www.cnn.com/2008/POLITICS/02/13/gop.campaign/index.html?eref=rss_politics