Matthew 11:3: Was John the Baptist losing his faith?

How is Matthew 11:3 usually interpreted in Roman Catholicism, Eastern Orthodoxy and mainstream Protestantism? > And said unto him, Art thou he that should come, or do we look for > another? (NIV, Matthew 11:3) The very fact that John the Baptist asked such a question strikes me as a bit illogical. John knew that he came to prepare the way for the Lord. Even before he saw the Lord he said it clearly that the One "the straps of whose sandals he was not worthy to untie" was coming after him, the One who "surpassed him because He was before him". When he first saw Jesus he right away proclaimed Him to be the Lamb of God who was going to take away the sin of the world. Later he said that Jesus was the true Bridegroom who "must be greater, while John must be less". All of these words send a clear message that John had no doubt in his mind about who Jesus was. However, when he was imprisoned he suddenly asked this kind of question. I heard many different theories. One claims that this was John's way of asking Jesus to deliver him from prison. Another one says that John was forced to ask this question by Pharisees in order to accuse Him later. Another theory says that John was simply losing his faith in Jesus. And yet another one that I don't remember well, says something about some Jewish tradition that, in fact, two Messiahs were supposed to come. So, what is an overview of common interpretations that are given to this matter in the three main branches of Christianity?