Clockwise from left: A screen shot from President Joe Biden's video declaring his backing for the Amazon workers organizing in Bessemer, Ala.; right top: Bessemer workers rally for support outside their warehouse; right bottom: An Amazon warehouse worker processes packages for shipment. | White House / RWDSUWASHINGTON—Democratic President Joe Biden has officially backed the union organizing drive at the big Amazon warehouse in Bessemer, Ala.In a two-minute-20-second video he posted on Twitter Feb. 28, and an accompanying shorter tweet, Biden declared the choice by the 5,800 workers there is...…Clockwise from left: A screen shot from President Joe Biden's video declaring his backing for the Amazon workers organizing in Bessemer, Ala.; right top: Bessemer workers rally for support outside their warehouse; right bottom: An Amazon warehouse worker processes packages for shipment. | White House / RWDSUWASHINGTON—Democratic President Joe Biden has officially backed the union organizing drive at the big Amazon warehouse in Bessemer, Ala.In a two-minute-20-second video he posted on Twitter Feb. 28, and an accompanying shorter tweet, Biden declared the choice by the 5,800 workers there is...WW…