Appearing on Tuesday night's episode of The Daily Show, former Senator Russ Feingold (D-WI) said that the Supreme Court's decision in the "Citizens United" case has brought about the worst corruption since the guilded age at the turn of last century.

Worse yet: Feingold, who collaborated with Sen. John McCain (R-AZ) on an elaborate piece of campaign finance reform that the Supreme Court struck down with its ruling, said that the situation will not change unless the Supreme Court's balance is tipped back in favor of liberals -- which is not guaranteed, even if President Barack Obama wins a second term.

Should be not win a second term, Feingold fears the worst, although he didn't confess that to Stewart. Speaking to Huffington Post reporter Amanda Terkel this week, Feingold warned that voting for any of the Republican candidates poses "a threat to our country" due to their lack of interest in and understanding of foreign policy.

Feingold's latest book, "While America Sleeps: A Wake-up Call for the Post-9/11 Era," is in stores now.

This video (part one of two) was broadcast by Comedy Central on Feb. 21, 2012.

Part two: