And Blackwater has protected almost every single US senator and congressman who has visited Afghanistan and Iraq over the past few years - even when Obama visited Iraq in 2006.
Neither the Obama campaign nor Blackwater is saying anything, though, and the Secret Service is implying strongly that the answer is no.
Blogger Christopher Beam saw my question on July 19 and, without attribution, reported on Slate:
But Obama isn't just any globetrotting senator. He's a presidential nominee, which means all his security arrangements at home and abroad are made not by the State Department but by the Secret Service. The Obama campaign refused to discuss his security detail, but a spokesman for the Secret Service told me that private contractors were not accompanying Obama in Iraq or Afghanistan. "We don't utilize contractors," said spokesman Ed Donovan. "We use military law enforcement and Secret Service."