Former US President Barack Obama has officially endorsed Kamala Harris’ candidacy for the presidency. “Earlier this week, Michelle and I called our friend Kamala Harris. We told her we think she’ll make a fantastic President of the United States, and that she has our full support,” Obama writes. The ex-president promised to help Harris and said he would “do everything we can to make sure she wins in November.” Earlier this week, Michelle and I called our friend @KamalaHarris. We told her we think she’ll make a fantastic President of the United States, and that she has our full support. At this…