After months of bitter campaigning, Bernie Sanders on Tuesday offered his long-awaited endorsement of Democratic presidential hopeful Hillary Clinton, saying he would work tirelessly to help his former rival win the White House. The joint appearance at a high school in Portsmouth, New Hampshire -- their first -- was the culmination of weeks of talks between the two campaigns aimed at unifying the party to most effectively take on Republican Donald Trump in November. "Secretary Clinton has won the Democratic nominating process, and I congratulate her for that," Sanders, 74, told a cheering crowd, with Clinton at his side.
