When President George W. Bush followed Mr. Rumsfeld to Mongolia a short time later, the White House quietly persuaded Mongolian officials not to give the president a horse, and they complied. Mr. Bush did partake in Mongolian horse culture another way, by drinking the local brew, fermented mare’s milk.
That fermented mare's milk beverage--what the Mongols call "airag" (айраг) and the Kazakhs call "kumis" (қымыз)--is alcoholic. That's the point of fermenting the milk. Maybe there was a kumiss exception to Bush's alleged temperance?
(see also my adventures with kumis)