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For this week’s Slate Plus bonus segment, the hosts discuss the Columbia School of Journalism’s report: Rolling Stone’s investigation: ‘A failure that was avoidable.’ Visit slate.com/gabfestplus and try it free for two weeks.

On this week’s Slate Political Gabfest, Emily Bazelon, John Dickerson, and David Plotz discuss the horrifying murder of Walter Scott by South Carolina police officer Michael Slager, the presidential campaign of Rand Paul (R-Kentucky), and the sesquicentennial of the assassination of President Abraham Lincoln.

Here are some of the links and references mentioned during this week’s show:

• A police officer in South Carolina murdered Walter Scott, an unarmed black man, during a routine traffic stop.
• Meet the brave young man who filmed the horrific murder, contradicting initial police reports.
• Rand Paul declares himself a candidate for the Republican presidential nomination. Can he win or will his “Daddy Issue” derail his campaign?
• John Dickerson argues that Rand Paul is running Obama’s presidential campaign all over again.
• Jason Zengerle explores whether or not Hillary Clinton is any good at running for president.
• Next week marks the sesquicentennial of the assassination of President Abraham Lincoln.

Emily chatters about the need for HBO’s Silicon Valley to “show us a girl that can code!”

John chatters about The Serious Lesson in President Harding’s Case of Gonorrhea.

David chatters about his serendipitous meeting with Malawian minister Martin Tom.

Topic ideas for next week? You can tweet suggestions, links, and questions to @SlateGabfest.

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The email address for the Political Gabfest is gabfest@slate.com. (Email may be quoted by name unless the writer stipulates otherwise.)

Podcast production by Mike Vuolo. Links compiled by Tarik Barrett.