On St. Patrick's Day, we take a look at how official Washington and the world of politics has celebrated the holiday.
President Obama drinks a Guinness with his ancestral cousin from Moneygall Ireland Henry Healy, center, and the owner of the pub in Moneygall Ireland, Ollie Hayes, right, at The Dubliner Restaurant and Pub in Washington on Saturday, St. Patrick's Day.(AP Photo/Carolyn Kaster)
Rick Santorum downed a pint at a Chesterfield, Mo., pub.(@MichaelBiundo)
Sen. Scott Brown, R-Mass., gets in the St. Patrick's Day spirit at a West Roxbury, Mass., pub.(@ScottBrownMA)
Elizabeth Warren, running against Brown, donned a green blazer and posed with her husband, Bruce.(@ElizabethforMA)
(From left) Emily Carriway, Emma Cohen, Darby Carlson, and Brennan Peters perform an Irish dance in front of Washington's National Archives building in 2007 during a parade celebrating St. Patrick's Day. (AP Photo/Manuel Balce Ceneta)
President Obama and Prime Minister Enda Kenny of Ireland attend a St. Patrick's Day celebration on Thursday in the East Room of the White House.(AP Photo)
The fountain outside the White House was dyed green while President Obama and Prime Minister Enda Kenny of Ireland met on Thursday in advance of St. Patrick's Day. (AP Photo)
President Obama and Irish Prime Minister Brian Cowen, accompanied by Rep. Richard Neal, D-Mass., and House Speaker Nancy Pelosi, D-Calif., walk down the steps of the Capitol in 2009 after attending a St. Patrick's Day luncheon.
(AP Photo/Susan Walsh)
In this March 17, 2008 photo, Irish Prime Minister Bertie Ahern presents President Bush with a bowl of shamrocks during a St. Patrick's Day ceremony at the White House. (AP Photo/Gerald Herbert, File)
William Patrick Fay, Ireland's ambassador to the U.S., pins a cluster of shamrocks on President Nixon's lapel on March 17, 1969 during a St. Patrick's Day celebration at the White House. The president is holding a foot-high Waterford crystal vase, bearing a White House etching, which also was presented to Nixon. (AP Photo/Gerald Herbert, File)
First lady Eleanor Roosevelt pins a green carnation on the lapel of President Franklin Delano Roosevelt's coat at the White House on March 17, 1941. Besides being St. Patrick’s Day, it was also their 36th wedding anniversary.(AP Photo)
President Clinton walks out of the Capitol behind members of the U.S. Air Force Reserve Pipe Band with House Speaker Dennis Hastert (left) and Bertie Ahern, prime minister of Ireland, after a St. Patrick's Day luncheon in 1999. Walking behind Hastert is John Hume, of the Social and Demoratic Labor Party in Ireland. (AP Photo/Doug Mills)
President Truman (left) shakes hands with Gov. Thomas E. Dewey of New York at the reviewing stand for New York City's annual St. Patrick's Day parade up Fifth Avenue in 1948. (AP Photo)