FILE - In this April 18, 2010 file photo, Israeli Prime Minister Benjamin Netanyahu looks at posters of stamps carrying the portrait of Theodor Herzl, the founder of modern Zionism, in Jerusalem. What is Zionism? The seemingly antiquated philosophical question has gained urgency in an Israeli election campaign where the liberal opposition has rebranded itself as the Zionist Union in a bid to take votes from the nationalist right of Prime Minister Benjamin Netanyahu -- sparking a debate about Israel's place in the world and setting the stage for a surprisingly climactic vote. (AP Photo/Sebastian Scheiner, Pool, File)