Heidi Stevens: Harriet Tubman on the $20 bill? Let’s get on with it

I’d like to think the defeat of Rep. Steve King’s proposed bill to keep Harriet Tubman off the $20 bill would be the end of that debate, but I doubt it will be. Presidential hopeful Donald Trump has called the move to put Tubman on the $20 bill “pure political correctness” and suggested she be put…