Congressman Alan Grayson (FL-09) has announced that tomorrow’s Bipartisan Ad Hoc Hearing on Domestic Surveillance will be postponed until early September. The ad hoc hearing was initially set to take place tomorrow at 9:30 a.m. Planned witnesses included Glenn Greenwald of The Guardian (via satellite); Julian Sanchez, Research Fellow at the Cato Institute; Michelle Richardson, Legislative Counsel at the ACLU; Yochai Benkler, Berkman Professor of Entrepreneurial Legal Studies at Harvard; and J. Kirk Wiebe, a former NSA senior analyst.