Two top democrats clash in key debate
It was their final face-to-face encounter before next week’s crucial primaries in Ohio and Texas.
Mr Obama has won the previous 11 primaries and caucuses.
Analysts say Mrs Clinton needs to win a majority of delegates in both states to stay in the race to choose the Democratic candidate at the national nominating convention in August, ahead of the November elections.
Accusations of dirty tricks and negative campaigning have dogged the past week of the nomination race.
In the opening minutes of the televised debate in Cleveland, Ohio, the two politely but firmly accused each other of spreading misinformation about their policies.
"The charges that Senator Obama’s campaign has made regarding fliers and mailers and other information that he has been putting out about my health care plan and my position on Nafta (the North America Free Trade Agreement) have been very disturbing to me," Mrs Clinton said.
Mr Obama retorted that his rival’s campaign had "constantly sent out negative attacks on us... We haven’t whined about it because I understand that’s the nature of these campaigns."
Both insisted they stood for universal healthcare, and that the other’s programme would leave some people without cover.
Mr Obama sought to draw a line, however, under the appearance of a controversial photograph of him wearing traditional Somali robes during a visit to Kenya in 2006.
He said he believed Mrs Clinton when she said she did not know where the photo had come from.
Mrs Clinton and Mr Obama went on to say that they would both seek to renegotiate Nafta with Canada and Mexico, under threat of opting out of the 14-year-old pact.
Many workers in Ohio and other states hard-hit by factory closures blame the deal for job losses.
It was on foreign policy that there was the strongest contrast between the two candidates, says the BBC’s Jonathan Beale in Washington.
Mrs Clinton repeated her stance that her qualifications and experience as former first lady and New York senator put her in the best position to be the next commander-in-chief.
Mr Obama replied that experience should not be confused with longevity in Washington, saying Mrs Clinton’s vote in favour of authorising the war in Iraq in 2002 was a massive strategic blunder.
It was hard to define an outright winner of the debate, says our correspondent, but there was nothing to suggest Mrs Clinton did enough to turn the tide that has been moving in Mr Obama’s favour.
Mrs Clinton now needs to win a majority of the delegates in the remaining state primaries and caucuses to stay in the race to choose the Democratic candidate for November’s presidential election.
Ohio and Texas, both big states, are being seen as must wins for her.
Several polls suggest Mr Obama is gaining ground in both Texas and Ohio. The Illinois senator is leading in Texas for the first time, with 50% compared to 46% for Mrs Clinton, according to a CNN poll.
On Tuesday, Mr Obama won endorsement from a former rival for the Democratic nomination, Senator Christopher Dodd.
On the Republican side, front-runner John McCain has also been campaigning in Ohio, as the party prepares to hold its own primary in the state, also on 4 March.
Incident
Bulldozer hits mine in Khojavand, people injured
Algerian citizens detained while attempting to cross Azerbaijan-Russia border illegally
Azerbaijan prevented attempt to smuggle over 35 kg of drugs into the country
Earthquake recorded on Azerbaijani-Armenian border
NEWS FEED
Pashinyan holds phone call with Zelenskyy
Bulldozer hits mine in Khojavand, people injured
Trump: US has full control of Strait of Hormuz and will maintain it
Mahmoud Abbas is visiting Türkiye
Iran says no progress on reviving interim peace deal with US
Kobakhidze: Strengthening Azerbaijan-Georgia-Türkiye ties is extremely important
Two new solar power plants in Nakhchivan to generate 118 million kWh of electricity - PHOTO
Pezeshkian: Current war is more complicated than previous ones
Oil production forecast for non-OPEC+ countries for 2026-2027 announced
Global oil demand growth to slow this year -FORECAST
F-16 training aircraft crashes in Türkiye, pilot survives - VIDEO
OPEC reveals Azerbaijan's daily oil production figures for July
Trump administration set to spend $900 million on White House construction: Report
Iran, US did not discuss ceasefire extension, senior Iranian official tells Reuters - UPDATED
Ambassador: Azerbaijan expects U.S. support in mine clearance technologies
Fifteen bodies recovered from lake where Zimbabwe passenger ferry capsized
Germany looks to give spy services more cloak-and-dagger powers
Colombia quake death toll tops 250 as rescuers race to find survivors
IEA expects global oil supply to decline in 2026
IEA lowers global oil demand forecast for 2026
International Energy Agency announces Azerbaijan's daily oil production figures
Two grain terminals at Russia's Novorossiysk halt work after Ukrainian attack, sources say
Erdoğan reveals key message of Mecca Agreement: The security of one of us is the security of us all
Zelenskyy: Ukraine strikes Russian naval base in Novorossiysk
Algerian citizens detained while attempting to cross Azerbaijan-Russia border illegally
North Korea says South Korea’s nuclear submarine plans pose threat to regional security
Putin: Russia will respond in kind if West seizes its merchant ships
Leadership of Ministry of Defense visits Combined Arms Army military units - VIDEO
Narmina Mustafayeva appointed Azerbaijan's Ambassador to Latvia
Azerbaijan changes ambassador to Sweden
Azerbaijan's Ambassador to Latvia recalled
Two dead and twelve injured, including minors, in Ukrainian attacks on the Russian region of Krasnodar
Bitcoin price falls below $64,000
Natural gas price in Europe approaches $720
President Ilham Aliyev’s remarks about National Leader Heydar Aliyev shared on social media
Ukraine halts strikes on tankers using Russian port at US request, FT says
Trump confirms he switched planes after Nato summit because of possible threat
420 km of roads to undergo major repairs in Nakhchivan
President Ilham Aliyev allocates 258 million manats to accelerate socio-economic development of Nakhchivan
Underwater drones are entering our lives
ADY: Construction underway on first 7 km section from Azerbaijan-Armenia border toward Ordubad - PHOTO - VIDEO
Azerbaijani oil price nears $96
US official: We will continue our work to strengthen our strategic position in the South Caucasus
Global oil production growth to accelerate next year - FORECAST
Zelensky: Ukraine submits proposals to US on ending war
Trump says he does not trust Iran
Rubio: Cuba will be on path to major change by end of Trump's term
Iraqi PM orders drafting of law to curb spread of weapons
Romania could lose EU funds over delay in shutting coal-fired power plants
Falling Danube water levels could force Romania to shut down last operating nuclear reactor