(A) John McCain
(B) ** Hillary Clinton
(C) Al Gore
(D) George W. Bush
EXPLANATIONS BELOW
Concept note-1: -This was Pennsylvania, on April 22. Although Obama made a strong effort to win Pennsylvania, Hillary Clinton won that primary by nearly 10%, with approximately 55% of the vote.
Concept note-2: -However, due to a close race between Obama and Senator Hillary Clinton of New York, the contest remained competitive for longer than expected; neither candidate received enough pledged delegates from state primaries and caucuses to achieve a majority, without endorsements from unpledged delegates (superdelegates).
Concept note-3: -The 2008 United States elections were held on November 4. Democratic Senator Barack Obama of Illinois won the presidential election, by defeating his challenger, Senator John McCain, and the Democrats bolstered their majority in both Houses of Congress. 2008 Presidential election results map.