By Diane Bartz and Thomas Ferraro
(Reuters) - The U.S. Senate's website was hacked over the weekend, leading to a review of all of its websites, in the latest embarrassing breach of security to hit a major U.S.-based institution.
The loosely organized hacker group Lulz Security broke into a public portion of the Senate website but did not reach behind a firewall into a more sensitive portion of the network, Martina Bradford, the deputy Senate sergeant at arms, said on Monday.
