Poor old Jefferson on the most useless pieces of currency, the nickel and the two dollar bill.
Maybe time for a do-over.
Get rid of pennies, nickels and quarters. Go to dimes and half dollars only and round everything off. The only reason we have pennies is because of the zinc lobby (look it up). So now you have two coins and six bills, 1, 5, 10, 20, and 50. (Did you know that Greta van Sustern said we should invent a $25 bill and put Tubman on that? And she has a TV show!)
So, that is eight people you can honour if you only want to put one person on a piece of currency. You have to put something on a coin on the obverse other than a person or else you won't have heads and tails anymore, and that would be a change I couldn't handle. But on the currency, you could put your high school yearbook page on the back (even freshman year when the pictures are small) and it would be OK.
So, to me, we've got eight primary choices to make.
I go for:
Washington
Lincoln
Jefferson
FDR
Easily our four greatest presidents. To me, a big drop off to the fifth.
That leaves four primary spots. Now I would leave the political scene behind and look to great Americans from other fields: science, the arts, sports, the humanities, etc.
My first pick is easy: Albert Einstein. He not only represents the pinnacle of scientific achievement, he was an immigrant who became a citizen of the US. The second is easy for me, too: Jackie Robinson. He transcended his sport in a fashion that was absolutely critical to our nation. Next I pick Emily Dickinson for the arts/humanities. One of the greatest poets ever and speaks to a quieter, yet passionate side of life.
Now I've got one more. Ben Franklin? Golda Meir? (she was an American citizen and a great world leader) Eleanor Roosevelt? Martin Luther King, Jr.? Harriet Tubman? Clara Barton? Cesar Chavez? Andrew Carnegie? Ernest Hemingway? Frank Lloyd Wright (jerk, but amazing architect) Willa Cather?
I'm torn between King and Barton. Might have to put in a twenty cent piece and go for both of them. Would put the rest on the back of the bills, maybe in pairs or something.