COPENHAGEN – As George W. Bush and Tony Blair learned the hard way, the public does not take kindly to being misled about the nature of potential threats. The after-the-fact revelation that the reasons for invading Iraq were vastly exaggerated – and in some cases completely fabricated – produced an angry backlash that helped toss the Republicans out of power in the United States in 2008 and may do the same to Britain’s Labour Party later this year.