The 2008 Democratic presidential primary--one of the most riveting and lengthy primaries in recent U.S. history--was analyzed extensively, from the altered calendar that advanced several states' primary dates to the historic role of gender and race. The primary was particularly fascinating because candidate Barack Obama, then senator from Illinois, was declared the presumptive nominee in June, a mere two months before the Democratic National Convention. How the delegates for the 2008 New Jersey Democratic presidential primary were divided may have influenced the number of delegates the candidates received--and possibly the primary's outcome. The authors examine the mathematical method used by the Democratic Party to determine the number of delegates received by each presidential candidate. They present examples from the 2008 Democratic primary which were developed for a spring 2008 mathematics class intended primarily for in-service teachers. However, the suggested methods and activities may be applied to any primary in any year. A supplement to this article is presented. (Contains 16 tables.)