I feel as though Mount Rushmore is only really fitting for the more influential presidents. Don't get me wrong now, President Obama has done a good job filling in such a title, but compared to the presidents of the past(regardless of their caucasian heritage) there leaves much to be desired. Aside from that, I honestly cannot picture the costs and resources it would take to put another face up. As long as I'm not paying for it through taxes then I don't have a problem with whose face gets put up.