Final answer:
L. Douglas Wilder was the second African American to be elected governor in the United States, after P.B.S Pinchback, who served temporarily. Deval Patrick was the next African American elected governor, while Barack Obama was a president, and Cory Booker has not served as a governor.
Step-by-step explanation:
The second African American to be elected governor in the United States was L. Douglas Wilder of Virginia. After P.B.S. Pinchback of Louisiana, who served for thirty-four days during impeachment proceedings of the previous governor, there was a long period without any African American governors until Wilder's election in 1989. Deval Patrick of Massachusetts became the second African American elected governor following Wilder. Barack Obama, although a highly influential African American politician, was not a governor but was elected as the 44th president of the United States. Cory Booker is also a significant African American politician, but he has not served as a governor.