(A) vice president
(B) congress
(C) ** senator
(D) supreme court
EXPLANATIONS BELOW
Concept note-1: -In 2004, Obama campaigned for the U.S. Senate, participating in the first Senate election in which both major party candidates were African American, the other being Alan Keyes.
Concept note-2: -The United States Senate career of Barack Obama began on January 3, 2005, and ended on November 16, 2008. He resigned his seat in the U.S. Senate upon being elected President of the United States.