1. May trial spectator conduct, in the form of content-based messaging, be "'so inherently prejudicial as to pose an unacceptable threat'" to the fair trial and confrontation rights guaranteed by the Sixth and Fourteenth Amendments?

2. If the presence of trial spectators declaring themselves, "Bikers Against Child Abuse," is not "inherently prejudicial," must the Government nevertheless prove it is harmless beyond a reasonable doubt, by demonstrating, inter alia, it could not have intimidated the jury or unfairly bolstered a witness's credibility in a manner that could affect the outcome of the trial?

May trial spectator conduct, in the form of content-based messaging, be 'so inherently prejudicial as to pose an unacceptable threat' to the fair-trial and confrontation rights guaranteed by the Sixth and Fourteenth Amendments?