Did He Free the Slaves...or Enslave the Free?

So here's a video of the guy who knocked Dick Lugar out of the Senate comparing the tax burden of the wealthy to 'slavery'.

And quoting Abraham Lincoln to make his point.
'Abraham Lincoln'...that name is really, really familiar. Where do I recognize it from?

Oh, yeah...now I remember! He was the guy who signed into law the very first progressive income tax. That's where I've heard of him before.

But, y'know, I'm pretty sure he'd agree with Mourdock on just about everything.

(h/t Ed Kilgore)