If Obama win, he is going to tax the super rich. Now the super rich only need to pay 15% long term capital gain and don't need to pay devidents income. Obama proposed 28% capital gain, if I remembered right. So the super rich want to cash out their prevous years long term capital gain before the tax policy change. They can always buy back later if they like their investerments. They hire professionals doing so for them. So they will get out before the small guys get out and get in before the small guys get in.