Authorities said the president's brother was briefly ushered into a supply closet at a subway station Friday, retreating with a security guard and a female aide to get away from the protesters. The picketers were marching to the exclusive Duquesne Club downtown where Santorum, R-Pa., was holding a fundraiser.
Bush was walking near the subway stop when several dozen pickets "tailed him and stayed with him and went into the Wood Street station," said Bob Grove, spokesman for the Port Authority of Allegheny County.
"(Bush) was quickly getting out of the way and not wanting to engage us," protester Jon Vandenburgh, a researcher for the United Steelworkers, told the Pittsburgh Post-Gazette.
About six or seven officers responded to control the crowd, Grove said, while approximately 75 protesters remained on the street.
Two officers used their stun guns on a pair of protesters who "were asked to leave but did not go," Grove said.
"It was a very tense situation. They were very close to the governor and shouting on top of him," Grove said.
The whole incident lasted about five minutes. No one was arrested or cited, Grove said. Bush was not injured.
A spokeswoman for the governor's office said Bush was taking a walk in Pittsburgh when his security detail from the Florida Department of Law Enforcement saw the protesters.
"The agents took an alternate route to get around them. The governor was safe at all times and had full confidence in the FDLE agents who were with him," Bush spokeswoman Alia Faraj said Saturday.