Polls have been taken (by a pollster who appears to work with a Vets' organization, per Google search) on how the American people would define success in the American attack on Iraq. I wish I could have taken down all the results for you -- I can't but I'll give you the website and you can listen to the audio later:
http://www.npr.org/programs/totn/
The polls investigated opinion on "If the US disarmed Iraq and got Saddam and sons out..." what if:
There were many Iraqis killed: that would not be a success
There would be 1000 Americans killed: that would be a success
America was disliked by many other countries: not a success
Further, most don't think Iraq will become a democracy. One woman (caller) asked, what would happen if we didn't find Saddam?
There was much much more. Sorry I was unable to take notes and pass it all along. Listen to the first 15 minutes of the audio of hour 2 of Talk of the Nation, link above. General Nash follows the pollster and is very interesting on What If We Screw Up During War Or After....