"I voted early" stickers are prepared for people who cast their ballots on the first day of early voting at the polling place at the Western Government Center in Henrico, Virginia, on September 19. Chip Somodevilla/Getty Images

Voters in Virginia, New Jersey, California and Pennsylvania have been inundated with campaign ads this year, with each state hosting critical off-year elections that offer a preview of the issues and arguments both parties are grappling with ahead of next year’s midterm elections.

Here are the ads getting the most spending during the critical final weeks of the off-year campaigns.

(Note: Ads are ranked by committee spending between September 1 and October 27. CNN limited the list below to one advertisement per committee.)

1. ‘Threatens,’ from opponents of Cali

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