We invaded Iraq because of all the WMD's they had which posed an immenent threat to our national security. Now that we found them the world is a safer place.
Bush planned on invading Iraq before he even became president. After 9/11 it became clear that we must hold Iraq responsible for what people in other countries did to us.
In order to better protect the country in the future massive efforts and monies were spent to put together an extremely effective Homeland Security team. This incredibly expensive system needed to be led by someone with real savvy, someone with horse show experience. Now that we've seen them in action we should all feel like America is a safer place.
We also clearly needed to crack down on all these crazy constitutional rights Americans had because it clearly wasn't very Patriotic to be walking around with all this freedom.
Who really needed freedom was the Iraqis. We've now established that Iraqi Freedom by killing them, blowing up their stuff, and raiding their homes at all hours of the day. They clearly want us there as only 75% of the people in Baghdad said they'd like us to "leave immediately".
Now that we've caught Bin Laden, the free Iraqis are all happy, got those WMDs, all cracked down on America's rights all on budget and with hardly any American soldiers getting hurt who could argue with profound effectiveness of this "War on Terror".