Amazon workers and organizers in Bessemer are making door-to-door house calls in favor of unionization. They’re sporting pro-union T-shirts and challenging anti-union messaging by Amazon-hired consultants. The goal is to convince their peers for the second time to unionize their warehouse. The union election started Friday by secret ballot. The new organizing tactics come two months after the National Labor Relations Board ordered a do-over election upon determining that Amazon unfairly influenced the first election last year. The Retail, Wholesale and Department Store Union estimates more than half of the six thousand workers who voted last time around remain eligible this time. But the union still faces an uphill battle from Amazon, which doesn't seem to have let up its aggressive anti-union stance.