National Debt Clock tally rises, battle over limit rages on

Amid mounting global fears the world's top economy is on the brink of default, the National Debt Clock in New York City serves as a nagging reminder of the United States' mounting debt. As the dollar slid to new lows and stock markets wobbled, the White House raised the stakes as Obama's Democratic allies and his Republican foes remained deadlocked in a bitter battle to raise the $14.3 trillion debt limit.Duration: 00:20