'Dark Knight' sets opening weekend box office record

• Story Highlights
• "Knight" earned $155.3 to beat opening weekend record of $151.1 million
  
• "Dark Knight" brought in $66.4 million on its first day in theaters
  
• Previous record was $59.8 million, held by "Spider-Man 3"
  
• Film has received a boost from stellar reviews, buzz around Heath Ledger
  
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