In Tuscaloosa Mr Obama said that Washington would do everything to help communities rebuild.
At least 297 people are known to be died of tornadoes that have copied by a swathe of the States, 210 in Alabama.
Also, widespread devastation was reported in Tennessee, Mississippi, Georgia and Virginia.
State of emergency has been in seven States declared, and federal aid is sent to Alabama.
'Heartbreaking'"We go to ensure that you are not forgotten," said Mr Obama Tuscaloosa survivors such as he and his wife, Michelle, who toured the devastated city.
Read the main story of Daniel Nasaw BBC News, TuscaloosaThe destruction here is almost apocalyptic. As far as the eye can see, Tornado reduces a busy thoroughfare in a thriving university town to a huge pile Wednesday rubble.
Twisted piles of metal and gravel, decades old trees, downed power lines and cars deprived paint - the scene on the McFarland Boulevard in Tuscaloosa conjures images of the Japanese tsunami.
The disaster scene is also incredibly quiet, save the occasional rumble of heavy equipment and the pounding of sledge hammers electricity company teams fight restore power.
Police have set up by roadblocks in the areas around the worst destruction - attempt to keep the area free from looters and onlookers.
Some people say that they run out of food and water, baby wipes, and SOAP. The call - in lines on local talk radio programs are filled with desperate appeals for help.
A Twister probably a mile wide (1.6 km) through the City earlier this week plowed.More than a million homes and businesses of Alabama are still without electricity.
Earlier in the White House, Mr. Obama said: "The loss of life is heartbreaking, especially in Alabama been."
Mr Obama added: "I want every American to know that the Federal Government will do everything, which by this disaster we to the restore can, has affected, and we will be with you, as you rebuild."
The US National Weather Service (NWS) has reports of nearly 300 tornadoes since the beginning of storms on Friday, more than 150 of them on Wednesday alone.
"They were most intense super cell thunderstorms, I think that everyone who ever was forecasting out has seen," said Greg Carbin of the NWS Storm Prediction Center in Oklahoma, the news agency associated press.
The NWS also said that a tornado in Mississippi had winds on Wednesday of 205 km/h (330 km/h) - the first EF-5 tornado in that State since 1966, the associated press news agency reported.
Tornado video - clip first courtesy Chris England/Crimson tide of productionsThis is the highest rating of the NWS for tornado damage.
In Alabama, emergency workers as they continue to survivors joined 2000 soldiers.
Many people were picking through the remains of the destroyed houses.
Governor of Alabama Robert Bentley said that he expected, that the death toll to rise as more bodies discovered.
The number of deaths by the recent series of tornadoes is the largest in the United States since 1974, when a sequence of twisters claimed 315 lives in 13 U.S. States.
'Hand wiped out'Tuscaloosa Mayor Walter Maddox after an aerial tour said: "We have neighborhoods, which essentially removed from the card."
A Tuscaloosa residents, Angela Smith, whose neighbor was killed, told of Reuters: "I have it." "I have in a closet, put a pillow over my face and required for their lives since it started me to suck."
Another city, Hackleburg, it was reported that "90% destroyed".The Mayor of Birmingham, William Bell, said "all areas of housing, only completely gone." Churches, gone. Companies, gone... "[it] seems like a bomb been is dropped".
More than 25 people died in Phil Campbell, a town of about 1,000 in Northwest Alabama.
Jerry Mays, Mayor of the city, said the tornado which destroyed the town grocery store and medical clinic was a half mile wide and traveled for about 20 miles (32 km).
"We have lost everything." Let's just say, "said Mr. Mays."
Hundreds of thousands of houses makes lost in Alabama have automatically after a nuclear plant when his power was hit by storms, though back-up systems worked, officials said.
Mississippi reported 33 deaths on Tuesday and Wednesday. In Smithville, Mississippi, many buildings were open, smart including a church, the Town Hall and the post.
At least 15 people were killed in Georgia and five in Virginia.
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