Four years ago, former President Clinton got his knuckles rapped for calling Sen. Barack Obama's presidential aspirations a "fairy tale." Now the 42nd president is appearing on the stump with No. 44, helping President Obama fundraise and making the case for his reelection. Mr. Clinton has also earned a reputation as a "campaign whisperer," imparting his views on political strategy to Obama’s inner circle. Here are five reasons for the former political foe of Clinton’s wife, Secretary of State Hillary Rodham Clinton, to go all out for the newest member of the Presidents Club.