In this June 14 photo, Democratic presidential candidate, Sen. Bernie Sanders, I-Vt., speaks during a news conference outside his campaign headquarters in Washington.
In this June 14 photo, Democratic presidential candidate, Sen. Bernie Sanders, I-Vt., speaks during a news conference outside his campaign headquarters in Washington. Alex Brandon Associated Press
In this June 14 photo, Democratic presidential candidate, Sen. Bernie Sanders, I-Vt., speaks during a news conference outside his campaign headquarters in Washington. Alex Brandon Associated Press