Why there's going to be a woman on the $10 instead of the $20

http://nymag.com/daily/intelligencer/2015/06/woman-on-the-10.html?mid=google&google_editors_picks=true

-snip-
The U.S. Treasury announced on Thursday that there will be a woman on paper currency in 2020 — the 100th anniversary of the 19th amendment. Just not the denomination advocates expected.

* * *

Although organizers have been pressuring the Treasury Department to depose Andrew Jackson and install a new woman leader on the $20, the federal government has decided to put a woman on the $10 — which was already in the process of being the first redesigned note in the new series of dollar bills. If any other denomination were chosen, America would probably have had to wait a long time before getting to see a woman among all those dead presidents and founding fathers that have remained unchanged since 1929; the first note in the last series of new dollar bills was released in 2003, the last one wasn't ready until a decade later.
-snip-