The peace was threatened when Obama supported the removal of Mubarak in Egypt.
Like Sadat, who made the deal in 1979 with Begin of Israel, Mubarak was a
dictator, and no doubt a ruthless one. However, to control those types of
countries, it takes extreme power. Now, with who know what taking over in
Egypt, Israel might well be back to having a full fledged enemy on it's
border rather than a tepid friend.