Fox News Sunday invited American Crossroads founder Karl Rove to discuss key 2014 midterm Senate races without disclosing Rove's relationship with the super PAC that has poured millions into influencing the outcomes of the Senate races being discussed.

Rove appeared on the September 21 edition of Fox News Sunday to discuss whether Republicans will take the Senate in the 2014 midterm elections. Rove lauded individual Republicans and trumpeted their chances of winning a Senate majority, but complained that “One advantage the Democrats have had is a big cash advantage” -- an argument he has previously used to fundraise for his political groups.

While host Chris Wallace identified Rove as a “former Bush White House advisor” and a Fox News contributor, he failed to disclose Rove's relationship to political groups fundraising to attack Democrats in the Senate.

American Crossroads and Crossroads GPS, political groups that Rove co-founded and continues to advise, have spent millions dollars attacking Democrats in the Senate races discussed on Fox News Sunday. Here's a breakdown of the groups' spending during the 2013-2014 election cycle from Open Secrets:

Here's a breakdown of the groups' spending on individual congressional campaigns from Open Secrets: