let's bring in our chief correspondent, jeff zeleny. the voting rights fight has not been easy, at least so far. >> reporter: it's not been successful and there is going to be a vote in the senate tomorrow, and the reality is the math isn't there for democrats to pass this. that did not stop president biden and vice president harris from invoking the legacy of martin luther king jr. today as they made pleas for democrats to support the bill. but it was the words of martin luther king, iii, the son of the civil rights leader, that echoed the loudest. >> so no matter what happens tomorrow, we must keep the pressure on and say no more empty words. don't tell us what you believe in. show us with your votes. history will be watching what happens tomorrow. black and brown americans will be watching what happens tomorrow. in 50 years students will read about what happens tomorrow, and know whether our leaders had the integrity to do the right thing. >> so you may wonder why are