CHICAGO--(BUSINESS WIRE)--To celebrate Valentine’s Day, Groupon is spotlighting the cities that take the lead for spectacular shows of affection, and is offering everyone the chance to ignite the romance with 20 percent off all local deals in its Valentine’s Day collection today and tomorrow (Feb 9 - Feb 10). Which cities in America have the cuddliest, sappiest center? To find out, Groupon looked at the most date-worthy deal categories and found the places that love them the most. Top City for