In 1993, Harry Reid introduced a strong anti-illegal immigration bill that would have also reduced legal immigration (also see). Then, in 2006, he offered an "unusual, rambling confession" apologizing for the bill. Just recently, he's criticized Sharron Angle for wanting to prevent illegal alien parents from taking advantage of birthright citizenship. As it turns out, his 1993 bill included the following (via this):

"TITLE X—CITIZENSHIP 4 SEC. 1001. BASIS OF CITIZENSHIP CLARIFIED. In the exercise of its powers under section of the Fourteenth Article of Amendment to the Constitution of the United States, the Congress has determined and hereby declares that any person born after the date of enactment of this title to a mother who is neither a citizen of the United States nor admitted to the United States as a lawful permanent resident, and which person is a national or citizen of another country of which either of his or her natural parents is a national or citizen, or is entitled upon application to become a national or citizen of such country, shall be considered as born subject to the jurisdiction of that foreign country and not subject to the jurisdiction of the United States within the meaning of section 1 of such Article and shall therefore not be a citizen of the United States or of any State solely by reason of physical presence within the United States at the moment of birth."

Saying this is a flip-flop is a childish way to deal with this issue. The correct way to deal with this issue is to point out that Reid is corrupt: what he supported in 1993 would have helped the U.S., but now he supports policies that hurt the U.S. and because he wants to obtain race-based power.

If you want to oppose Harry Reid and want to raise the level of debate in the U.S., go to one of his public appearances and ask Reid this question.