shameful

I wonder why some of the Presidential and Vice Presidential candidates withdraw their participation in a debate in Abs Cbn? Same thing with QC Mayoral Candidate Herbert Bautista, also withdraw from participating in a debate with his opponents (Mhel Mathay, Mike Defensor)..what are they up to?..afraid perhaps? or proud that they don't need to lay down their cards because they are confident that they could win the election?..oohh well..that's sucks..