(CBS News) WASHINGTON - A new Politico-George Washington University poll shows Mitt Romney leading President Obama by one point, 48 to 47 percent.

In that poll, independent voters prefered Romney by a ten-point margin.

Over the weekend, meanwhile, the president formally started campaigning for another four years in office.

Unofficially, the president's re-election campaign has been under way for several months.

If you look at his speeches to large audiences in swing states, they look and sound a lot like campaign rallies.

But over the weekend, he made it official - and if you live in one of the key states he needs to carry, you're starting to see campaign ads like this: "We're coming back because America's greatness comes from a strong middle class. Because you don't quit, and neither does he."

The Obama campaign was out Monday morning with its most significant ad buy yet, in 9 states, touting the administration's accomplishments during the president's first term. ***

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*** They intended to buy 60 second spots to tout the Administration's accomplishments, but had trouble filling more than 3 seconds, so they opted for30 second spots, using the remaining 27 seconds to chant "hope and change." (j/k)