WASHINGTON: President Barack Obama endorsed one-time rival Hillary Clinton to be his successor on Thursday (Friday in Manila), signaling to Democrats it is time to unify after a bitter primary campaign and beat Donald Trump. “Tens of millions of Americans made their voices heard. Today I just want to add mine,” Obama said in a video endorsement. “I’m with her.” Their first joint campaign event will take place next Wednesday in Green Bay, Wisconsin. Obama won the state in 2008 and 2012, but Democrats expect a tough fight this year. Obama’s endorsement, although long expected, is a shot in the arm for the Clinton campaign. She has struggled for a year against leftist rival Bernie Sanders. The 74-year-old ran an unlikely grassroots campaign that swelled to a 12-million-strong movement. Clinton finally clinched the nomination just days ago, prompting Obama to offer his backing.