Reports that Obama visited Karachi in 1981:
“According to his campaign staff, Mr. Obama visited Pakistan in 1981, on the way back from Indonesia, where his mother and half-sister, Maya Soetoro-Ng, were living. He spent ‘about three weeks’ there, Mr. Obama’s press secretary, Bill Burton, said, staying in Karachi with the family of a college friend, Mohammed Hasan Chandoo, but also traveling to Hyderabad, in India.”
http://www.theconservativevoice.com/article/31752.html
and there’s this about Karachi:
“Karachi: Where Terrorists Hide And Thrive”
http://www.jamestown.org/terrorism/news/article.php?articleid=2368485
In the research I have done he traveled using a passport under the name of BArry Soetoro.