Eventually, it pushed approval from a hair above 50% to a hair below 50%, and contributed some to sinking the presidential bid of John 'Hundred Years of War' McCain. [1]

Perhaps if an incredibly comprehensive package of sanctions could have been part of the package, it would have changed more minds faster.

[1] He's rehabilitated his political image, somewhat, since then, but man, oh man, that was quite the foreign policy plan.