As Senator
edit- Letter to John McCain on ethics reform (2 February 2006)
- Letter regarding the housing crisis (22 March 2007)
- Letter to Howard Dean (3 May 2007)
- Letter regarding David Palmer (26 July 2007)
- Letter to Aníbal Acevedo Vilá (12 February 2008)
- Letter to Tavis Smiley (13 February 2008)
- Letter to the LGBT Community (28 February 2008)
- Letter of resignation from Trinity United Church of Christ (30 May 2008)
- Letter to the Alice B. Toklas LGBT Democratic Club (1 June 2008)
- Letter to George W. Bush regarding Israel (24 June 2008)
- Prayer at the Western Wall (July 2008)
- Letter to the Editor of the New York Times (14 July 2008)
- Letter to Business and Professional Women/USA (17 July 2008)
- Letter to the Dalai Lama (24 July 2008)
- Letter to James A. Grogan (15 August 2008)
- Letter to Vibe Magazine (9 September 2008)
- Letter to the National Minority AIDS Council (19 September 2008)
- Letter to the National Albanian American Council (19 September 2008)
- Letter regarding NASA (21 September 2008)
- Letter to Prime Minister Dr. Manmohan Singh (23 September 2008)
- Letter regarding the Hmong (25 September 2008)
- Letter regarding the Open Debate Coalition (6 October 2008)
- Letter to Timothy E. Hoeksema (10 October 2008)
- Letter regarding the Department of Defense (20 October 2008)
- Letter regarding the Bureau of Prisons (20 October 2008)
- Letter regarding the Department of Homeland Security (20 October 2008)
- Letter regarding the Department of Labor (20 October 2008)
- Letter regarding the Environmental Protection Agency (20 October 2008)
- Letter regarding the Department of Housing and Urban Development (20 October 2008)
- Letter regarding the Department of Veterans' Affairs (20 October 2008)
- Letter regarding the Social Security Administration (20 October 2008)
- Letter regarding the Transportation Security Administration (20 October 2008)
- Letter to the National Council of Textile Organizations (24 October 2008)
As President-elect
edit- Letter to Millions (4 November 2008)
- Letter to the people of Kenya (7 November 2008)
- Letter of resignation from the Senate (8 November 2008)
- Letter of thanks to the people of Illinois (16 November 2008)
- The Action Americans Need (5 February 2009)
Received
edit- Letter from John McCain on lobbying reform (6 February 2006)
- Letter from Toni Morrison (28 January 2008)
- Letter from Ralph Nader (3 November 2008)
- Letter of congratulations from the Dalai Lama (5 November 2008)
- Letter of congratulations from Nicolas Sarkozy (5 November 2008)
- Letter of congratulations from Tarja Halonen (5 November 2008)
- Letter of congratulations from Mahmoud Ahmadinejad (6 November 2008)
- Letter of congratulations from the TYO (6 November 2008)
- Letter from Chuck Norris (10 November 2008)
- Letter from Henry C. Karlson III (14 November 2008)
- Letter from Willie Nelson (November 2008)
- Letter from Nancy Killefer (3 February 2009)
- Letter from Nancy Pelosi and Harry Reid (12 February 2009)