the best thing i ever did was marry rosalind. that is the pinnacle of my life. we ve had 69 years together. still together. and so that s the best thing that happened to me. reporter: carter said his biggest regret as president was he was unable to free the americans taken hostage in iran on his watch. i wish i had sent one more helicopter to get the hostages. we would have rescued them and i may have been reelected. that may have interfered with the foundation of the carter center. if i had to choose between four more years and the carter center, i think i would choose the center. he said he received calls from both presidents bush, clinton, obama and their wives. they ve been sending peach pies, which is his favorite. he plans on teaching sunday school this weekend as he does every sunday.