Conversation so far:
What is is connection with Mary Landrieu?
O'Keefe stated that he had entered Landrieu's office to investigate complaints that she was ignoring phone calls from constituents.
What did he do once he entered the office?
O'Keefe and colleagues were arrested in New Orleans in January 2010 and charged with entering federal property under false pretenses.
Did they take video recordings of the office?
CANNOTANSWER.
Was he found guilty?
The charges in the case were reduced from a felony to a single misdemeanor count of entering a federal building under false pretenses.
O'Keefe and the others pleaded guilty.

Question: What was the sentence?
Self-contained rewrite: What was the sentence given to O'keefe for entering a federal building under false pretense?