Last year, over 100 companies signed a letter declaring their principled support for voting rights, their opposition to the state bills restricting voting, and their belief that action to protect voting rights was critical. But, as the fight for voting rights hits a critical juncture, virtually all of these corporations have gone quiet.

Corporations that publicly threw their support behind strengthening the Voting Rights Act donated thousands to Republicans who blocked the legislation this week.

After a violent mob stormed the Capitol building in January, hundreds of corporations pledged to make changes to their political giving. Some corporations pledged to withhold PAC funding to the 147 Republicans who voted to overturn the election, setting the stage for the riot. Other corporations said they were suspending all PAC activity and others promised to reevaluate their giving criteria in light of the violence.

Rachel Maddow Show: I'm glad 150 major U.S. businesses are backing the John Lewis Voting Rights Advancement Act, but how serious are they about helping?

Amazon, Starbucks and Pepsi are among the companies that signed on to a letter calling on Congress to pass legislation that would expand the Voting Rights Act.