I haven't read the past 23 pages yet, but I'm going to preemptively guess that the people arguing against this new design are probably saying something like this:
"It's fine the way it is! Andrew Jackson was a war hero and the first real Democrat! Just ignore the fact he was a massive slaveholder who sent thousands of Native Americans to their deaths against the wishes of the Supreme Court! Tradition!! Plus, who the hell is Harriet Tubman anyway?"
Well Jackson was the democrat to be voted in as president. The same democrat party that supported slavery segregation, the same democrat party that Obama is in. Isn't that some irony.
Oh come on, Harm, you know that's not right. The Democratic party essentially switched sides with the Republicans in both social and political issues during the 60s. Back then, the Democratic party was the champion of small government. Are you really saying that's the 'same party' as the modern Democratic party?
srsly america, why would you replace THIS?!

Andrew Jackson is a badass. You cant push Andrew Jackson into a corner like that.
That portrait is depicting Andrew Jackson winning the Battle of New Orleans, which 'ended' the War of 1812 like a year after the treaty of ghent was already signed. He's a badass when it comes to winning wars that have already been won.