I think this is right:
Yesterday's immigration protests will be remembered as a turning point. The pro-amnesty, zero-enforcement coalition gambled that it could take to the streets and intimidate the majority of Americans into backtracking on their plans to toughen immigration law. It was a bold gamble for the open-borders bunch - and they lost.
Actually, I think the turning point came during earlier demonstrations, when the assembled masses waved their Mexican flags. But the basic point is that Americans, as tolerant a people as you'll find anywhere, do not like to be lectured by people who break into their country -- and their supporters -- about how intolerant they are of people who break into their country.
Funniest (unintentionally so) reporting I heard was on a network news broadcast saying that the demonstrators were upset with U.S. House proposals that would "criminalize illegal immigration."