Question: William Peters' co-author of "For Us, the Living" delivered the invocation at the second inauguration of what president?
Context: The second inauguration of Andrew Jackson as President of the United States took place in the House chamber of the U.S. Capitol on Monday, March 4, 1833.  The inauguration marked the commencement of the second four-year term of Andrew Jackson as President and the only four-year term of Martin Van Buren as Vice President.  Jackson was sworn in by Chief Justice John Marshall on a frigid day with snow still on the ground.  This was the first inauguration for which two inaugural balls were held. The second inauguration of Calvin Coolidge as President of the United States, was held on Wednesday, March 4, 1925 at the eastern portico of the United States Capitol in Washington, D.C..  The inauguration marked the commencement of the second (only full) term of Calvin Coolidge as President and the only term of Charles G. Dawes as Vice President.  The Chief Justice, former president William Howard Taft administered the presidential oath of office.  This was the first inauguration in which a former U.S. President administered the oath, and the first to be broadcast nationally on radio. Michael Arthur Newdow (born June 24, 1953) is an American attorney and emergency medicine physician.  He is best known for his efforts to have recitations of the current version of the Pledge of Allegiance in public schools in the United States declared unconstitutional because of its inclusion of the phrase "under God".  He also filed and lost a lawsuit to stop the invocation prayer at President Bush's second inauguration and in 2009 he filed a lawsuit to prevent references to God and religion from being part of President Obama's inauguration. The second inauguration of George W. Bush as President of the United States took place on Thursday, January 20, 2005.  The inauguration marked the beginning of the second term of George W. Bush as President and Dick Cheney as Vice President.  Ailing Chief Justice William Rehnquist administered the Oath of office for the last time before his death in September 2005.  Attendance at the inauguration has been reported as being around 100,000, 300,000, or 400,000. Myrlie Louise Evers–Williams (née Beasley; born March 17, 1933) is an American civil rights activist of the Civil Rights Movement and journalist who worked for over three decades to seek justice for the murder of her civil rights activist husband Medgar Evers in 1963.  She was also chairwoman of the NAACP, and published several books on topics related to civil rights and her husband’s legacy.  On January 21, 2013, she delivered the invocation at the second inauguration of Barack Obama. For Us the Living: The Medgar Evers Story is a made-for-television biopic that aired on PBS on March 22, 1983.  The film was based on the book, "For Us, the Living", by Myrlie Evers-Williams and William Peters. The second inauguration of Bill Clinton as President of the United States was held on Monday, January 20, 1997 on the West Front of the United States Capitol Building in Washington, D.C..  The inauguration marked the commencement of the second four-year term of Bill Clinton as President and Al Gore as Vice President.  This was the last presidential inauguration to take place in the 20th century, and the first to be streamed live on the internet. The second inauguration of Grover Cleveland as the 24th President of the United States took place on Saturday, March 4, 1893.  The inauguration marked the commencement of the second four-year term of Grover Cleveland as President and the only term of Adlai E. Stevenson I as Vice President.  Cleveland had previously been the 22nd president, and is the only president to serve two non-consecutive terms.  Chief Justice Melville W. Fuller administered the Oath of office.  It snowed during the inauguration. The second inauguration of George Washington as President of the United States was held in the Senate Chamber of Congress Hall in Philadelphia, Pennsylvania on Monday, March 4, 1793.  The inauguration marked the commencement of the second four-year term of George Washington as President and of John Adams as Vice President.  The presidential oath of office was administered to George Washington by Associate Justice William Cushing.  This was the first inauguration to take place in Philadelphia (then the nation's capital), and took place exactly four years after the new federal government began operations under the U.S. Constitution. The second inauguration of Franklin D. Roosevelt as President of the United States was held on Wednesday, January 20, 1937.  The inauguration marked the commencement of the second four-year term of Franklin D. Roosevelt as President and John Nance Garner as Vice President.  It was the first inauguration to take place on January 20 as per the 20th Amendment to the U.S.Constitution.  This was also the first time the Vice President took his Oath on the Inaugural Platform during the ceremonies.
Answer: Barack Obama