By requesting a response from the person or corporation that you are sending the petition to has so many advantages. Recently signed a petition about medical malpractice and a week later i recieved a letter from Sen. Bruce Caswell of Michigan explained in detail how he was planning on supporting the petition. The most remarkable thing about the letter is it was hand signed wow I thought he actually read it and took time to hand sign it even if it may have been typed by a secretary that alone insured me that I have made a change. Who knows by requesting a response to your petition you might even change your mind by what feedback you might recieve.
So when making a petition be sure to request a response either written or by email but ask for one. Lets make sure they're listening.