I would emphasize that the teachings of the Qur'an are divine and US constitution is man-made. US constitution promotes values that are endorsed by the Qur'an and Islam. In other words, its not that Qur'an is "good" because it is similar to the values of the US constitution. It is the other way around. As Muslim Americans, we do not have to chose between one or the other. We also need to realize we are comparing a secular document with Scripture. Make sure you remember these points upfront to put it all in perspective.
Best of luck