Sen. Barack Obama said he voted for the surveillance bill because it will help protect the nation.
Sen. Barack Obama's vote for a federal surveillance law that he had previously opposed has sparked a backlash from his online advocates, who had energized his campaign for the Democratic presidential nomination.
In October, Obama had vowed to help filibuster an update of the Foreign Intelligence Surveillance Act (FISA) that gave telecommunication companies that had cooperated with President Bush's warrantless wiretapping program immunity from lawsuits.
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