The Democratic Senatorial Campaign Committee is launching an online video Wednesday in hopes of pushing back against growing, multimillion-dollar ad campaigns funded by the Karl Rove-affiliated Crossroads GPS and American Crossroads.

The keystone of the Crossroads GPS push is an effort called the "New Majority Agenda" -- reportedly funded to the tune of $10 million -- around which the outfit is spending millions on TV ads.

ProPublica estimated the "dark money" group, which doesn't disclose its donors, has dropped more than $40 million on television spots in this election. And Crossroads has announced ads costing $4.7 million more Wednesday.

The DSCC campaign aims to draw attention to the source of Crossroads' money, and to what those secret donors want to buy -- which, the DSCC claims, is protection for millionaires and billionaires, deregulation and radical changes to Social Security and Medicare.

"Voters need to know that no matter what Republicans say on the stump, this will be their agenda in the Senate," said DSCC spokesman Matt Canter. "It is time to hold Republican candidates accountable for Karl Rove's so-called 'New Majority Agenda,' which would gut Social Security and Medicare in order to pay for more tax breaks for billionaires and Big Oil."

Watch the DSCC video above.

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