Democratic incumbent Sherrod Brown holds a small lead over his Republican challenger, Josh Mandel, in Ohio's U.S. Senate race, a new poll from Rasmussen shows. According to the survey, 46 percent support Brown, who was first elected in 2006, while 42 percent support Mandel, the state treasurer.

Brown's lead is the smallest in the Rasmussen poll since March, when Mandel came within three points. The RealClearPolitics average shows Brown with a much healthier advantage, and the race still leans Democratic. But with Ohio occupying its usual role as a battleground state for the presidential race, the fortunes of Barack Obama and Mitt Romney in the Buckeye State could have further implications down the ballot.

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