Opinion surveys in France, on how people intend to vote on the EU constitution, are playing like a see-saw.Neck-and-neck campaigning just days ago showed that the ‘Yes’ side had re-taken the lead for the first time in six weeks. But some polling institutes show the ‘No’ ahead. The government has stepped up its effort to get the EU’s first constitution approved in the referendum on May 29. In Paris, French President Jacques Chirac, in a speech to European culture ministers, said closer European integration would not infringe on nations’ unique cultural identities. He said the constitution clearly established each state’s right to define and drive its own cultural policy. Polling of voter intentions show the constitution’s supporters and opponentshovering close to the fifty percent line, the ‘no’ camp losing some of its advantage.