The protesters want to raise public awareness and warn U.S. citizens about human rights violations committed by the Obama administration, which includes the non-closure of the Guantanamo Bay prison holding terrorism suspects, said campaign coordinator Mbuyiseni Ndlozi.
"Their administration's government is not welcome, and is being received with antagonism," Ndlozi said. "Therefore they'll have to rethink the standards by which they hold their government."
`Protesters carried signs that read: "No, You Can't Obama," a message inspired by the "Yes We Can" campaign slogan adopted by the president during his first run for election.
Obama and his family were expected to arrive in South Africa later Friday as part of a tour of three African countries."