(A) Mitt Romney
(B) Ralph Nader
(C) Gene Admason
(D) ** John McCain
EXPLANATIONS BELOW
Concept note-1: -Obama won a decisive victory over McCain, winning the Electoral College and the popular vote by a sizable margin, including states that had not voted for the Democratic presidential candidate since 1976 (North Carolina) and 1964 (Indiana, Virginia, and Nebraska’s 2nd congressional district).
Concept note-2: -On November 4, 2008, Obama defeated the Republican nominee, Senator John McCain of Arizona, making him the President-elect and the first African American elected President.
Concept note-3: -They defeated the Republican ticket of businessman and former Governor Mitt Romney of Massachusetts and Representative Paul Ryan of Wisconsin. As of 2023, this is the most recent election in which a major party’s presidential and vice presidential nominees would end up serving into the presidency.