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U.S. President Barack Obama and Republican candidate Mitt Romney take their campaigns to the key political battleground state of Ohio Tuesday, as they seek to win over voters with four weeks left before the election.

The latest polls indicate the two candidates are virtually tied ahead of the November 6 vote.  Ohio is one of the few so-called swing states that are expected to decide who wins.

Despite losing ground in the polls to Mr. Romney following a debate on domestic policy last week, Mr. Obama told supporters at a fundraising event Monday night that he "very much" intends to win the election.  He urged his backers to be "almost obsessive" in their efforts until election day.

Earlier Monday, Mr. Romney accused the president of being a weak leader, especially with regard to the Middle East.