Will the Trend Continue?

According to Hillary Clinton's official Web site, no candidate has won the Democratic nomination without winning Pennsylvania since 1972.

The site also notes that no Democrat has won the presidency without winning Pennsylvania since 1948.

With 40 days to go before the April 22 Pennsylvania primary, Clinton holds a 16 percent lead over Barack Obama. (Source: RealClearPolitics average of four Pennsylvania polls conducted between March 5 and 12.)

However, as we've seen continually over the course of the campaign for the Democratic nomination, nothing is certain.

According to CNN.com's Election Center 2008, Obama leads Clinton in delegates by a margin of 1,611 to 1,480. With 2,025 delegates needed to secure the nomination, political observers have questioned whether either candidate will be able to clinch victory prior to the Democratic convention in August.