Ted Kennedy’s Immigration and Nationality Act of 1965
A Boston Globe article attributed Barack Obama’s win in the 2008 U.S. Presidential election to a marked reduction over the preceding decades in the percentage of whites in the American electorate, attributing this demographic change to the Act.[3] The article quoted Simon Rosenberg, president and founder of the New Democrat Network, as having said that the Act is “the most important piece of legislation that no one’s ever heard of,” and that it “set America on a very different demographic course than the previous 300 years.”
http://en.wikipedia.org/wiki/Immigration_and_Nationality_Act_of_1965
That, along with the massive Illegal Alien Amnesty of 1986, which Kennedy also played a major role in getting passed, drastically changed the demographic makeup of this country, enough that allowed a marxist like Obama to be elected President.
25 years ago, this clown would not likely have been elected to the U.S. Senate from any state, let alone even come close to winning the nomination for President from either major party. Obama might have won the nomination for President from Communist Party USA or the Socialist Workers Party 25 years ago, but that would have been as close as a clown like Obama would have gotten to the Presidency then.