Summary
John McCain is attacking Barack Obama’s opposition to the Kyl-Lieberman amendment, which (among other things) called for labeling Iran’s Islamic Revolutionary Guard Corps as a terrorist organization. McCain claims that Obama’s opposition means that he also opposed calling the IRGC terrorists. We find otherwise.
Obama cosponsored an earlier bill that also called for designating the IRGC as a terrorist organization.
The Kyl-Lieberman amendment did more than just label the IRGC terrorists. Obama stated at the time that he opposed the bill on the grounds that it constituted "saber-rattling."