Rich people who got there the easy way (inheritance, luck) will notice the taxes, sure, but the hard working rich man that everyone keeps talking about will not, in the way people are suggesting.
I say this because, as has been mentioned earlier in the thread, rich and hard working people are still hard working because A) they enjoy their work, B) they enjoy the respect that comes with their profession, C) They would be bored without their work, D) they have unquenching ambition to create something, or leave a legacy, or be the best at what they do.
It's because of reasons like this that incredibly wealthy CEO's continue to work year after year even with their tens of millions in salary or bonuses, far beyond what they spend. Read almost any financial magazine and read interviews done with top (hard working rich men) businessmen (and women). Most suggest directly or indirectly that money is no longer the reason they keep doing their job, it is more of an added bonus. I can't talk for all or quote a source, but over the years of reading and talking to people in those positions, it seems to be a majority.
To say that it takes the incentive out of succeeding, or working hard, is ludacris. These people are still going to gain greater wealth as they work harder, only at a rate of what? 1-3% less? HUGE difference, surely wages growth won't swallow that up over the next year.... oh wait.
The fact is, its only taking a few percent extra from people who already have more than enough to cover neccessities and luxuries.
I come from a fairly wealthy family, albeit in australia, but our top bracket here is about 10% higher than in the US and starts at $180,000, and I still see no problem with it. Christ, give a bit you greedy fools.