GROWING optimism in the wake of the American economy and the number of voters came to the polls to open the way for Obama's victory.

President Barack Obama is re-elected for a second term in a very tight election against Republican challenger, Mitt Romney. President Barack Obama's victory triggered quick reactions and excited.

Across America, Obama supporters cheered. Supporters of Mitt Romney wonders why Republicans failed to reach the White House.

In his victory speech, President Obama pledged to work with Congress to address the various problems facing the country.

"And, in a few weeks and the next few months I will reach out and work with the leaders of both parties to address the challenges we can only solve together. The deficit we change our tax code. Lot to be done, "Obama said in his speech.

Romney says it's time to put aside partisan politics and work together for the good of the country.

"This is a challenging time for America, and I pray President Obama will be successful in leading our country," Romney said in a speech to accept his defeat.

The economy is a major problem for almost 60 percent of voters surveyed as they left the polls. Analysts said that the improving economy strengthens support for President Obama in the key state of Ohio, where he failed to prevent the collapse of the American auto industry and save jobs.

Allan Lichtman is a professor of political science at the American University in Washington. He said, "It was not an election campaign that decided the election, but the way the government., And not just the economy, but many other factors are decisive."

Another surprise of this election is the gender gap. Obama won women voters, while the majority of men choose Romney. President Obama is also getting a lot of noise from minority groups, particularly Hispanics, who provide the greatest support for the Democratic Party since 1996.

Lichtman said Republicans need to expand the network of supporters. "Republicans will not survive unless they find a way out, but it's very difficult for them to attract minorities and women, given their stance on abortion, immigration, and civil rights. This is a difficult task for Republicans," said Lichtman.

President Obama will return to face a divided Congress. Democrats still control the Senate, while Republicans retained control of the House.

Analysts say Obama supporters know that the party could be short-lived victory, unless he and the policy makers get a common ground to solve the pressing problems of the nation.