1st 6: Gun violence victims given background checks for yelling in Senate gallery 

A Boston bombing: Latest and media fail

B Professor Johanna Fernandez () on Mumia Abu-Jamal

C West, TX explosion and OSHA violations with Mike Elk

D Cliff on gun failure, progressive vows to primary Senators Pryor and Begich.

1st 6: Former SC Gov Mark Sanford caught trespassing on ex-wife's property

A Andrew Gumbel (@AndrewGumbel), author, Oklahoma City: What the Investigation Missed--and Why It Still Matters(Shuster to interview)

B Influential austerity study debunked
C-D House of Cards actor Jennifer Osborn (in studio) - on TV show and 4/20 celebration of weed

1st 6: Star Trek Geek Talk

A Social Media - Dr. Digipol on Twitter's role in Marathon Bombing

B Activist of the Week: Patty Kupfer, Managing Director, America's Voice (@AmericasVoice)

C Review of "42" with Jackie Robinson--and the untold story of the role of Montreal in Robinson's career

D Daniel Marans how it should be: Rich v. poor, not old v. young