Call Him Barack O'Bama

WASHINGTON (AP) -- As White House fountains ran green for St. Patrick's Day, the president saluted strong U.S.-Irish ties in a warm welcome for Ireland's leaders and turned to a critical campaign backer, Pittsburgh Steelers owner Dan Rooney, to fill the post of U.S. ambassador to Ireland.

"This is an affirmation between one of the strongest bonds between peoples that exists in the world," Obama said as he met in the Oval Office with the Irish prime minister, Brian Cowen.

And in a wee bit of Blarney, Obama boasted of Irish ancestry.

"I, personally, take great interest on St. Patrick's Day because, as some of you know, my mother's family can be traced back to Ireland," the president said.

He even joked to Cowen: "We may be cousins. We haven't sorted that through yet."

Earlier, Obama tapped Rooney for the ambassadorship. A lifelong Republican, Rooney endorsed Obama during Pennsylvania's contentious Democratic primary last year and campaigned for him throughout the election. The president returned the favor by nominating him to the ambassador post, a move that had been the subject of almost fever-pitch speculation in Irish circles in recent days.

"I am honored and grateful that such a dedicated and accomplished individual has agreed to serve as the representative of the United States to the Irish people. Dan Rooney is an unwavering supporter of Irish peace, culture and education," Obama said in a statement.

From appearance to agenda, the White House was in an unmistakable Irish mood.

First Lady Michelle Obama came up with the idea to dye the fountains on the White House's North and South lawns green, said spokeswoman Katie McCormick Lelyveld. She was inspired by her hometown of Chicago, where the city marks the national holiday of Ireland by dyeing the river green.

The president took part in a shamrock ceremony at the White House, and then was meeting with Northern Ireland's First Minister Peter Robinson and his deputy, Martin McGuinness, in a less high-profile gathering in his national security adviser's office.

Administration aides have singled out Cowen, Robinson and McGuinness as leaders who have resisted partisan reactions to a series of killings in Northern Ireland that threatens a decade's break in violence.

Two soldiers were fatally shot on March 7 and a policeman murdered two days later. Washington condemned the deaths as senseless acts of political obstruction aimed at destroying the stability in Northern Ireland and supported leaders who urged restraint.

Obama said it was no surprise that the opponents of a peace would try to undo it.

"The real question was this: When tested, how would the people of Northern Ireland respond?" Obama said in one of his appearances with Cowen. "And now we know the answer. They responded heroically. They and their leaders on both sides have condemned this violence and refrained from the old partisan impulses."

Obama and the Irish leaders were attending a Capitol Hill luncheon celebrating the holiday. Then the Irish guests were invited back to the White House for a cocktail reception Tuesday night that the new president's aides say will be equal parts diplomacy and revelry.

Obama told Cowen that it was great he was visiting the Oval Office, but it was too bad he was missing the Irish parade in Chicago, Obama's hometown. He called it "one of the great events in America."

Both Obama and Cowen also made a point to characterize the U.S.-Irish relationship as one of substance in bilateral and global affairs.

"It is a great day for the Irish in America today," Cowen said.

For the evening event at the White House, Pulitzer Prize-winning poet Paul Muldoon from Northern Ireland was to be featured. The White House also invited Maggie McCarthy, a traditional Irish dancer and musician from Cork, and vocal group Celtic Thunder. The Shannon Rovers, the official pipe band of Chicago's St. Patrick's Day festival, also were set to perform.