American Crossroads has found the unlikeliest of partners: Sen. Elizabeth Warren (D., Mass.).
In an ad released Monday, the Super PAC headed by Karl Rove attacked Clinton for reports that the Clinton Foundation has accepted millions of dollars from countries barred from making political contributions.
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A portion of a Warren speech hitting populist tones narrates the ad while headlines slamming the Clintons flash on screen. Democrats have pleaded for Warren to run for president as an alternative to Clinton.
The ad hits Clinton as part of the "rigged" system for powerful, well funded special interests.