WASHINGTON — Amazon is aligned with the Bidenadministration on several fronts.

It backs a $15-an-hour federal minimum wage. It has pledged to meet all the goals of the Paris climate agreement on reducing emissions. It has met with the administration to discuss how to help with the distribution of Covid-19 vaccines.

But a union drive at one of its warehouses in Alabama has the retailer doing a political balancing act: staying on the good side of Washington’s Democratic leaders while squashing an organizing effort that President Biden has signaled his support for.

Amazon workers in Bessemer, Ala., have been voting for weeks on whether to form a union. The voting ends Monday. Approval would be a first for Amazon workers in the United States and could energize the labor movement across the country.

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“I think everyone is seeing through the P.R. at this point and focusing on both their economic and political power,” Sarah Miller, a critic of Amazon, said about the company. Ms. Miller, who runs the American Economic Liberties Project, an antitrust think tank, added, “I think the narrative is cooked now on their status as a monopoly, their status as an abusive employer and their status as one of the biggest spenders on lobbying in Washington, D.C.”