Making her first trip to Iraq as secretary of state, Clinton said the United States would keep supporting the Iraqi government as Washington prepares to withdraw all its troops from the country by the end of 2011.
Clinton landed on a military transport plane a day after two female suicide bombers blew themselves up outside a Shi'ite Muslim shrine in Baghdad, killing 60 people in the deadliest single incident in Iraq in more than 10 months.
It was the third major attack in two days, bringing the two-day death toll to at least 150 people.
Recent high-casualty attacks have fanned fears of a resurgence in violence. President Barack Obama has ordered U.S. combat troops to prepare to pull out of Iraqi cities in June and there are doubts about the effectiveness of Iraqi forces.
Asked if the latest bloodshed could rekindle sectarian warfare, Clinton replied: "I see no signs of that at this time.
"I think the suicide bombings ... are, in an unfortunately tragic way, a signal that the rejectionists fear that Iraq is going in the right direction," she added, speaking to reporters in Kuwait late on Friday before flying to Baghdad on Saturday.
Clinton noted that the worst single attack in the Northern Ireland conflict -- an August 1998 car bomb that killed 29 people in the town of Omagh -- occurred after the 1998 Good Friday accord that largely ended the sectarian struggle.
She suggested the nation had turned a corner and that Iraqi society had wearied of the violence. "In any conflict, there comes a point -- sometimes it's far later than we would wish -- where a critical mass of people on all sides just say 'enough,'" she said.
TOWN HALL MEETING
In a whirlwind visit, Clinton plans to meet Iraqi President Jalal Talabani and Prime Minister Nuri al-Maliki, to be briefed by Gen. Ray Odierno, the U.S. commander in Iraq, and to meet privately with a group of Iraqi women.
She said the highlight of her day was likely to be a "town hall" meeting with about 150 Iraqis, as well as U.S. officials, at the U.S. embassy, saying this was a first for a senior U.S. official in Baghdad.
"I want to listen. I want to respond to their concerns and questions. And I want some feedback and ideas about ... how we are going to make this transition as successful as possible," Clinton said.
The sectarian warfare and insurgency unleashed by the 2003 U.S.-led invasion have receded sharply over the past year, but Iraqi security forces still face huge challenges as they take on policing and military operations from the United States.
A national election scheduled for the end of the year has also heightened apprehensions as political parties and armed groups jostle for dominance of the oil-producing nation.