In 2006, New Jersey voters elected Robert Menendez, a Democrat, to the U.S. Senate. His term ends in 2012. A group of New Jersey Tea Party activists want to start to circulate a recall petition against Menendez. The Secretary of State has ruled that recall cannot be used for federal office-holders, but the Tea Party group is suing in state court to overturn that decision. See this story.
In 1967 an Idaho state court ruled that Idaho’s recall procedures cannot be used against members of Congress. The 1995 U.S. Supreme Court ruling U.S. Term Limits v Thornton also suggests strongly that states cannot recall members of Congress.