President Barack Obama will head back to the battleground state of Ohio next week.

The Obama re-election campaign announced Thursday that the president will hold a campaign event in Cincinnati on Monday.

The stop in the Buckeye state will be the president's eighth trip there this year. Obama held his first official campaign rally of his re-election bid in Columbus in early May and last week he spent two days on a campaign bus tour through the northern part of the state.

Ohio's a battleground or swing state, which will be heavily contested by both major parties in the presidential election. The most recent poll in the state, conducted late last month by Quinnipiac University, indicated the president with a 47%-38% lead over Republican challenger Mitt Romney. In the 2008 election, Obama won the state by five points over Sen. John McCain, the GOP presidential nominee.

Romney was last in Ohio on June 21.

Since April 10, the Obama campaign has spent nearly $10 million to run ads on broadcast TV in Ohio. And the Romney campaign has shelled out more than $3.7 million. When you add in money spent by independent organizations, including advocacy groups and so-called super PACs, there has been more than $22 million in ad buys in Ohio.

The figures come from data provided to their clients by Kantar Media/Campaign Media Analysis Group, which tracks political ad spending on broadcast TV and national cable. The data covers the period from April 10 through May 24. April 10 is the day former Sen. Rick Santorum of Pennsylvania suspended his presidential campaign. Santorum was Romney's main rival for the Republican presidential nomination, and when he left the race, the former Massachusetts governor became the presumptive GOP nominee.