Obama focuses on traditional battlegrounds

Barack Obama has bragged about his 50-state strategy to compete all across the country.

But his campaign manager told supporters today that the election could be determined, as in the past two contests, on the usual suspects of battleground states.

"Our fight in the battleground states is going to be tougher than a lot of you may think. Take Florida, where George Bush won by just 381,000 votes in 2004. The campaign we're running there is going to cost more than $39 million," David Plouffe wrote in an email soliciting more donations.

"This race has come down to a matter of weeks, and it could pivot on a few tremendously important swing states. Supporters like you are strengthening this campaign in amazing ways -- voter registration efforts, organizing in your communities, and bringing folks into the political process like never before."

An attached video shows a map with 17 battleground states. They include the traditional ones of Florida, Indiana, Iowa, Michigan, Missouri, New Hampshire, New Mexico, Ohio, Pennsylvania, and Wisconsin.

The map also highlighted a handful where Obama is seeking to turn the tables on Republican John McCain: Colorado, Georgia, Montana, Nevada, North Carolina, North Dakota, and Virginia.

Plouffe said about 10 percent to 15 percent of voters remain undecided in the battleground states. He argues that the campaign is now about change and the economy -- terrain where Obama has the edge on McCain.