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All In Agenda: What disqualifies a politician?

All In Agenda for Tuesday, May 13.

1. Just hours before he is slated to be executed, Texas inmate Robert James Campbell is granted a stay. Chris Hayes is joined by Campbell's attorney, Maurie Levin, and by Dahlia Lithwick to discuss Campbell's formal challenge,

2. Rais Bhuiyan, was shot in the face by Mark Stroman days after the attack on the World Trade Center in 2001. A decade later, Bhuiyan came to his attacker’s defense. Journalist Anand Giridharadas, author of The True American: Murder and Mercy in Texas, tells the story on All In.

3. Did Republican Strategist Karl Rove really insinuate that Hillary Clinton is suffering from brain damage? Chris Hayes is joined by National Correspondent at Businessweek, Josh Green.

4. Republican Senate candidate Joni Ernst told Iowa's Des Moines Register that she has “reason to believe there were weapons of mass destruction in Iraq.” Chris Hayes asks the question: What should disqualify a candidate from holding office? Helping to answer that question are Executive Editor at The Nation, Richard Kim, Editor-in-Chief, Roll Call, Christina Bellantoni, and Distinguished Senior Fellow,, Bob Herbert.