The 18 states allowing for recall are as follows: Alaska, Arizona, California, Colorado, Georgia, Idaho, Kansas, Louisiana, Michigan, Minnesota, Montana, Nevada, New Jersey, North Dakota, Oregon, Rhode Island, Washington and Wisconsin. http://www.ehow.com/how_2096900_recall-us-senator.html
Even if the Recall is not successful, it gives people a valuable lesson tool for the free citizens in these states...and the rest of the country.
IF your state is not listed, it is time to start campaigning to get the ability to recall a Senator on your state ballot. States seeking to assert their sovereignty should strongly consider a Senatorial Recall initiative to be added.
FYI, early on in this thread they were discussing this and concluded that the recalls in those states are for their state senators, not for their federal senators.