Both of the top candidates in Iran's race for president say -- they won. Voters flooded polling places following a race that sharply divided the country.On one side -- the current hard-line president, Mahmoud Ahmadinejad.His chief opponent -- former Prime Minister Mir Hossein Mousavi a more moderate candidate who promises better ties with the U-S.Joel Brown has more from Washington.Iran's massive voter turnout may break records.And its energetic presidential election could improve ties to the U-S.PRESIDENT OBAMA SAYS, - "WE THINK THERE'S THE POSSIBILITY OF CHANGE."Shortly after the polls closed -- 'both' of the top candidates claimed victory. But, the final ballot count isn't complete yet.A victory for Mir Hossein Mousavi could help ease the tensions that have grown during current President Mahmoud Ahmadinejad's term.Mossavi's more moderate campaign excited young and wealthier Iranians -- eager for better relations with the world and more rights at home.But in rural Iran and it's working class neighborhoods -- support for Ahmadinejad was strong.- "HE'S A PRESIDENT OF POOR PEOPLE. NOT PEOPLE WHO HAVE MONEY."Voting was extended for several hours -- allowing the people lined up, to cast their ballots.Joel Brown / CBS News- "The White House says when it comes to dealing with Iran, policy is more important than personality. Iran's nuclear ambition is the big concern."Despite the world's objections, Ahmadinejad has pressed forward with Iran's nuclear program. Moussavi hasn't pledged to end it, but he does seem more open to talks with the U.S.The White House sees the close race as a good sign.PRESIDENT OBAMA - "WE ARE EXCITED TO SEE WHAT APPEARS TO BE A ROBUST DEBATE TAKING PLACE IN IRAN."But there are already complaints of ballot shortages and a government crackdown on text messaging to suppress the vote.Joel Brown CBS News The White House.Script