MIAMI — Joe Biden’s ground game in Florida is getting a jolt from billionaire Michael Bloomberg.Bloomberg told the Miami Herald on Monday that he’s giving $4 million to get-out-the-vote efforts on behalf of the Democratic presidential nominee in the nation’s largest swing state. With the money, grassroots organizations held back for months by the coronavirus pandemic plan to promote Biden by talking face to face with voters in minority and “underrepresented” communities.“The COVID-19 pandemic has upended this election season and changed the way campaigns are run in many ways — but one thing th…