Outside money has been pouring into the contest.
Last week, the Campaign Finance Institute said more outside funds had been spent in the Virginia Senate race than any other contest in the country ($4.3 million).
The latest spot, courtesy of Crossroads GPS, accuses Kaine of being a "lover" of taxes. Kaine has countered with an attack on Allen's fiscal record. The ad closes with an image of Allen in a bolo tie and a cowboy hat.
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