Which famous woman on $10 bill?

Washington Post:

The Obama administration has proposed putting a woman on the $10 bill. While it has not announced candidates for the honor, a number of names have come up in recent discussions over whether a woman would appear on U.S. paper currency. Who would you vote for?

The two who immediately sprang to my mind were not even on the ballot: Emily Dickinson and Billie Holiday. Oh well, Rosa Parks will do quite nicely.