(Found via Wikipedia, there's also this bizarre incident.)
Seth Armus reports to the H-Net Antisemitism listserve:
She acknowledged that this may have been a mistake, explained how it happened, and indicated that they were in the process of providing "multiple entries" on Zionism, including one written by (I believe) Michael Oren (or someone from the Shalem center). In addition more entries on nationalisms and their relation to race will be included. While she was very upset by the controversy, she was not, to my mind, sensitive enough of the distinctions between objective and subjective criteria in scholarship. Still, I was pleased with the degree of seriousness the press was taking. They have stayed in touch with me and have requested my input. It seems they will not remove the original article, but will take a variety of other steps to address concerns. Not good enough, but better than I expected.