I think we should put Jonas Salk on the $20. He saved more lives in America and around the world than Harriet Tubman, any president or any "liberating" military intervention this country has ever embarked on.
It would help refute the stereotype the rest of the world has of us as a country that isn't interested in science or in "book learnin'" in general.
I sort of agree with this, but maintain that a debate over who is on the 20 dollar Bill is stupid. If it's trending on Twitter or whatever, that just shows the state of contemporary political debate is in the gutter. Jackson's just a guy with big hair to most people. In 20 years, cash will be obsolete anyways.