President Joe Biden has officially endorsed Vice President Kamala Harris as the Democratic Party’s presidential nominee for the upcoming November’s general elections. This announcement follows Biden’s decision not to seek re-election. Biden, 81, expressed his support for Harris, 59, in a tweet on Sunday afternoon, shortly after publishing an open letter to Americans explaining his decision. “Today I want to offer my full support and endorsement for Kamala to be the nominee of our party this year. Democrats it’s time to come together and beat Trump. Let’s do this,” Biden…