The university said Notre Dame's president, Rev. John Jenkins and the student body president made the invitations Monday, continuing a long tradition.
Obama's appearance at the 2009 commencement sparked protests over his support of abortion rights and embryonic stem-cell research. Some called for Jenkins to resign, and dozens of bishops questioned Jenkins' judgment for inviting the president to speak.
Pro-Life Action League spokeswoman Ann Scheidler says the group has no problem with the campaign invitations because both candidates are invited to speak. Group members protested before Obama's graduation speech.