This Bloody Mary served at the Nationals Park in D.C. came with a meat straw, which infuses each sip with an umami flavor. Ben Hirko first came up with the concept while tending bar one snowy night in 2009. The straws have become a hit. Tamara Keith/NPR hide caption

President Obama has stayed neutral in the race to replace him, but as rumors swirl that Vice President Biden could jump in, a White House spokesman said Monday it's possible Obama will endorse. Saul Loeb/AFP/Getty Images hide caption

Students protest the rising costs of college loans in Los Angeles in 2012. Citing bank bailouts, the protesters called for student debt cancellations. David McNew/Getty Images hide caption

At Hillary Clinton's event, Carl Babbitt raised his hand high until Clinton called on him to tell his story. Here, Babbitt holds two photos of himself — one from when he was 29, in prison serving time for murder. Tamara Keith/NPR hide caption

Hillary Clinton has already turned over 30,000 emails. Jae C. Hong/AP hide caption

The Clinton campaign's debate watch war room was actually just a conference room with a big-screen TV at the front. Fifteen or so staffers huddled over their laptops ready to pounce. Tamara Keith/NPR hide caption

Black Lives Matter activists confronted Democratic candidates Martin O'Malley and Bernie Sanders at a Netroots Nation event earlier this month. O'Malley used the phrase "all lives matter" twice, which he later apologized for. Ross D. Franklin/AP hide caption