Rudy Giuliani just picked up the endorsement of a former rival for the nomination, former Wisconsin Governor Tommy Thompson.

"Rudy Giuliani has shown that he is a true leader. He can and will win the nomination and the presidency," Thompson in a statement given to the Associated Press. "He is America's mayor, and during a period of time of great stress for this country he showed tremendous leadership."

Thompson had a strong conservative record as governor and as secretary of health and human services under President Bush, while also being supportive of stem-cell research. He dropped out of the race due to a poor showing in the Iowa Straw Poll, after a campaign marred by fundraising problems and some gaffes on the campaign trail.