This would appear to be more than just a rumor:
“According to Iraqi Foreign Minister Hoshyar Zebari, Obama made his demand for delay a key theme of his discussions with Iraqi leaders in Baghdad in July.
“He asked why we were not prepared to delay an agreement until after the US elections and the formation of a new administration in Washington,” Zebari said in an interview.”
The source seems to be legitimate.
This item turns out to be true and not just a rumor.