Recent losses suggest Bernie Sanders may be losing influence

So far this year, 20 candidates backed by Sen. Bernie Sanders, I-Vermont, have won primary races, and 27 have lost. Since the 2016 election, Sanders’ organization, Our Revolution, has been supporting candidates around the country. With more losses than victories, some are questioning the power of his endorsement. Politico National Politics Correspondent David Siders joined CBSN to discuss. Watch video for more details.