The Teamsters broke with the union tradition of backing Democrats on Wednesday. Here's a look at how it is different from other major unions.

Almost two-dozen local Teamsters unions and joint councils representing approximately 1 million Teamster-affiliated workers have endorsed the vice president.

The vice president at large of the Teamsters union John Palmer joins CNN’s Erin Burnett and shares why he decided to endorse Vice President Kamala Harris even though his union declined to endorse a presidential candidate.