Joe Trippi, formerly the Chief Strategist on John Edwards' campaign, disclosed in a piece in Campaigns and Elections that he has some regrets about not telling Edwards to stay in the race.
I didn't tell him what I should have told him: That I had this feeling that if he stayed in the race he would win 300 or so delegates by Super Tuesday and have maybe a one-in-five chance of forcing a brokered convention.

I should have closed my eyes to the pain I saw around me on the campaign bus, including my own. I should have told him emphatically that he should stay in. My regret that I did not do so-that I let John Edwards down-grows with every day that the fight between Hillary ClintonHillary Diane Rodham ClintonDemocrats ask judge for quick ruling on McGahn subpoena Hillary Clinton: 'Every day Stephen Miller remains in the White House is an emergency' The Memo: Centrists change tone of Democratic race MORE and Barack ObamaBarack Hussein ObamaThe Memo: Centrists change tone of Democratic race Political purity tests are for losers Deportations lower under Trump administration than Obama: report MORE continues.