15% to 20% of any large population can usually be expected to be radical, but that isn't the group that wins elections (though it *can* be the group that makes the most noise).
I think its probably higher than that... most americans see the court as a political object and it has become one. Im betting that a good 30-40% of the voters want to see bush's judges go down in flames. Lets remember while our ideas do win and are better on their merits, people still vote against us. As scary as it is, about 58-59?(forget the actual number) people voted for kerry.