I guess when talking about DNC Chairwoman Debbie Wasserman Schultz, instead of saying it is a case of "the blind leading the blind" you would have to say it is a case of "the mentally challenged/incompetent leading the mentally challenged/incompetent".
http://townhall.com/tipsheet/christinerousselle/2016/02/06/behold-the-most-tonedeaf-tweet-in-the-history-of-twitter-n2115905
Behold: The Most Tone-Deaf Tweet in the History of Twitter
Christine Rousselle | Feb 06, 2016
http://townhall.com/tipsheet/christinerousselle/2016/02/06/behold-the-most-tonedeaf-tweet-in-the-history-of-twitter-n2115905
Behold: The Most Tone-Deaf Tweet in the History of Twitter
Christine Rousselle | Feb 06, 2016