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Both races also have involved bitingly negative advertisements and attacks from the candidates, further turning away voters, experts say.

Mr. Gonzales said the negative tone of the campaigns - not the candidates’ personal wealth - has done more to funnel voters to the “undecided” category.

“Whether it’s the negative ads or the charges being lobbied back and forth in the debates and in the media, it has caused people to maybe jump ship from one candidate but not necessary jump on with somebody else,” he said.

Many of the candidates also had little or almost no statewide name recognition entering their races, adding to voter confusion, Mr. Gonzales said.

While Mr. Meek’s campaign war chest is a fraction of his opponent’s, the South Florida congressman has sought help from an old and influential friend, former President Bill Clinton, who stumped for Mr. Meek on Monday.

“I don’t think we’ve seen anything like the Florida Senate race in its ups and downs, ” Mr. Gonzales said.

c This article is based in part on wire service reports.