Palin was booed (and cheered) at the Philadelphia Flyers hockey game yesterday, too, although extremely loud music was begun to help drown out the boos. She had brought one of her many children with her, as usual.
I have been seeing some discussions about the role of the Secret Service in the McCain campaign. Apparently, the SS has to investigate every possible threat that may become evident during these political rallies, and they've certainly had their work cut out for them recently with the McCain supporters. The suggestion is that the SS told McCain he'd better tone it down.