NEW ORLEANS AP – Last month, protesters marched in front of Democratic Sen. Mary Landrieu’s office to criticize her support for health care legislation and complain that they couldn’t get through on her office phones.

Now Landrieu’s phones are at the center of federal charges against four men accused of trying to tamper with them. Among those arrested was conservative activist James O’Keefe, who gained notoriety last year with hidden-camera videos showing him dressed as a pimp exposing irregularities in offices of the liberal community-organizing group ACORN.