Here's an interesting web site and petition. It's called "4% for Freedom" by the Heritage Foundation. http://www.heritage.org/fourpercent/

While The American Legion supports spending 5% of GDP on defense, Heritage's 4% is a floor not a ceiling. Moreover, both organizations are in synch in calling for a strong national missile defense. Without a strong defense, there would be no United States or other "domestic priorities" to even worry about.