Obama attended Columbia College from 1981 to 1983, after transferring in his junior year from Occidental College.
http://www.columbia.edu/cu/news/08/11/obama.html
http://www.columbia.edu/cu/news/08/11/obama.html
Your statement is a direct quote from the Columbia publication.
It sure is a curious quotation, especially in light of Orly Taitz's discovery about Obama's attendance at Columbia, (At the linked image, click to enlarge, and then look at the last line.) which is that Obama was only at Columbia from Sept 82 to May 83. Normally one would speak of transferring "after their sophomore year" or "for their junior year," and not "in their junior year."
ML/NJ