United States President Barack Obama, a member of the Democratic Party, was endorsed or supported by some members of the Republican Party and by some political figures holding conservative views in the 2008 election. Although the vast majority of Obama's support came from liberal constituencies, some conservatives identified in him shared priorities or other positive attributes. As in any election, voters can and sometimes do cross party lines to vote for the other party's nominee. Republican and conservative Obama supporters were often referred to as "Obama Republicans", "Obamacans" or "Obamacons".

Douglas William Kmiec is an American legal scholar, author, and former U.S. ambassador. He is the Caruso Family Chair and Professor of Constitutional Law at Pepperdine University School of Law. Kmiec came to prominence during the 2008 United States presidential election when, although a Republican, he endorsed Democrat Barack Obama. In July 2009, he was nominated by President Obama to serve as U.S. Ambassador to Malta. He was confirmed by the Senate and served for close to two years as ambassador to Malta. He resigned his post effective May 31, 2011.