(A) ** Senator
(B) Governor
(C) Representative
(D) Mayor
EXPLANATIONS BELOW
Concept note-1: -A member of the Democratic Party, he was the first African-American president of the United States. Obama previously served as a U.S. senator from Illinois from 2005 to 2008 and as an Illinois state senator from 1997 to 2004, and previously worked as a civil rights lawyer before entering politics.
Concept note-2: -The 2008 presidential campaign of Barack Obama began on February 10, 2007, when Barack Obama, then junior United States senator from Illinois, announced his candidacy for President of the United States in Springfield, Illinois.
Concept note-3: -The first piece of legislation signed by Obama was the Lilly Ledbetter Fair Pay Act on January 29, which promoted fair pay regardless of gender, race, or age. Lilly Ledbetter joined Obama and his wife, Michelle, as he signed the bill, fulfilling his campaign pledge to nullify Ledbetter v.
Concept note-4: -Barack Obama served three terms in the Illinois Senate from 1997 to 2005, when he was elected to the United States Senate.