This statement is not true. Thompson does not oppose these amendments. He merely recognized that they aren't achieveable now. and should not be where our CURRENT effort is directed. As he puts it, with respect to the right to life isseu, "Let's get Roe-v-Wade repealed, then count our marbles and see where we are." It is only a question of emphasis and timing.
He has made direct statements opposing the Human Life and Marriage Amendments. He has even proposed a weaker marriage amendment.