With his deft turn as a besieged JFK, Bruce Greenwood steals Thirteen Days from Kevin Costner.
Kevin Costner's overdone Boston accent detracts from ''Thirteen Days''
But he's not the first actor to stumble when playing a Beantown role, says Ty Burr
Why ''Thirteen Days'' may struggle at the box office
Historical subjects (and Kevin Costner) haven't sold many tickets lately, says Bruce Fretts