Obama grants Clinton endorsement; Sanders vows persistence

Aired: 6/9/2016 | 0:06:49 | Clip
President Obama further enhanced Hillary Clinton’s great week by formally endorsing the presumptive Democratic nominee Thursday. The announcement came just hours after the president met with Sen. Bernie Sanders, who refused to drop out of the race but vowed to work toward party unity and do everything possible to defeat Donald Trump. Political director Lisa Desjardins and John Yang report.