Riverside, San Diego, Brown, Columbia, and Texas regularly accept people from MA's. Stanford, Princeton, Chicago, and NYU seem to have something against MA's. Some MA's place into those programs, but not as often as they do into other ones. I think NIU has no placements into any of them (!!), Tufts has plenty into Stanford, but not many into the others, Brandeis has no placements into Chicago, University of Houston has none into Chicago or NYU, one into Stanford, and 3 into Princeton, and GSU has two into Stanford, and none into NYU, Princeton, or Chicago (and not for lack of applicants).