It's not that simple, someone making $250K in Montana might be rich, someone making $250K living in Manhatten is living check to check. If a guy making $250K has adjusted his lifestyle to require $250K, that person can no more afford a tax increase than a guy making $50K.
Why not tax the people savings, since Obama seems to think the rich are sitting on piles of money. Increase capital gains tax on stock and bond gains. How about all elected officials and their appointed staffs take pay cuts and give up some of those Cadillac health care plans they give themselves? Let's make those on welfare work for their money rather sit at home and do nothing. Let's stop bailing out businesses that aren't profitable rather than print cash and hand it to them. Stop sending money overseas when we need it here.