Presumptive Democratic presidential nominee Sen. Barack Obama (Ill.) will begin airing a commercial during the Olympic Games promoting his efforts to keep jobs in the United States.

The advertisement, which goes up Monday, pledges that Obama will “end tax breaks for companies that ship jobs overseas” and “help businesses that create jobs here.” Obama, an announcer states, has “a plan to put hard working Americans first.”

The campaign plans a national cable buy for the ad, which will run in all 50 states.

The spot focuses on concerns about the economy, beginning with an uplifting image of a home being built and asserting that Obama has “a plan to build.” Obama will “put the middle class ahead of corporate interests,” the announcer states. Not forgetting the environment, the piece includes a shot of a group of churning windmills.

The ad, a “positive” piece that does not mention presumed Republican nominee Sen. John McCain (Ariz.), finishes with a look at the same home it began with, now completely built.