A Googledoc calling on President Joe Biden to step aside from his reelection campaign and anoint Vice President Kamala Harris is being shared en masse by Democratic donors and other supporters as concern over Biden’s continued viability as a general election candidate grows. CNN first reported on the existence of the document called “The case for Kamala,” which was written by an anonymous author. That document plainly states that if Democrats hope to defeat former President Donald Trump in November, they can no longer count on Biden to be the party’s standard-bearer in the final stretch of the…