After the Charlie Hebdo attack, dozens of world leaders marched arm in arm with President Francois Hollande during a unity march in Paris. But many of these leaders aren't exactly supporting free speech and a free press back home.
Up to 3 million marchers flood streets across France after 17 people were killed during three days of attacks
Rare admission of error appears aimed at blunting criticism that decision to send low level official was disrespectful
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