Democratic dictators?

. PHOTO: AFP
Now the question arises if sovereignty belongs to the people, how come the rulers are being able to implement their own decisions against the public opinion. For every policy he makes, the ruler is heavily scrutinised. Now my point is, Mr. Bush and Mr. Blair were voted to power. And as rulers of democracies they are accountable to the people.
But in reality are they acting democratically enough? Therefore, what is the difference between dictatorship and democracy?