The Occupy Wall Street movement has been protesting for a couple of months now. Their message (the main one) is that the government is controlled by the richest 1%. They also spent a lot of time complaining about student debt and capitalism. So, who have the hurt the worst? President Barack Obama.
The damage done to Obama is on several levels. OWS has gotten a lot of press. At first it was completely favorable and the movement had a high approval rating in the polls. At that point President Obama, Vice-President Biden, Nancy Pelosi, and other Democrats gave OWS their approval. As time has gone on, the various Occupiers have had violent confrontations with the police and their approval rating has dropped. It is too late for the Democrats to disown them. The movement is still popular with the far left crowd and any politician distancing himself from OWS will offend them. But the swing voters will react the opposite way. A politician who approved of the Occupiers will be tarnished in their eyes.
Obama has been engaging in mild class warfare since his inauguration but OWS has stolen his thunder on that. Obama wants to raise taxes on the rich by 4%. OWS wants to confiscate their money. This may help Obama with the moderates but it still makes him look weak.
Currently, when Obama isn't in Europe insulting the heads of France or Israel, Obama is on the campaign trail running against the rich. He is trying desperately to get his jobs bill passed. The trouble is that the press is bored with this and quit giving it any coverage. Instead the are covering the Occupiers. The worst thing that can happen to a politician is to be ignored, especially when that politician is on the campaign trail. This is where OWS hurts Obama the most.
The one thing that could hurt Obama even more is if OWS starts protesting politicians along with the Wall Street. OWS hates the bailouts and crony capitalism that defines the Obama economic team. The OWS is convinced that the government is being run for the benefit of the 1% and Obama is the head of the government. At some point they might decide that he is a big part of the problem.