To contact Foster and ask him the question yourself, his contact information is:
P.O. Box 703
Geneva, IL 60134
Although I'm pretty conservative, I haven't been shy about contacting my own congressman and senators about issues (including glbt issues) that are important to me. I admit that I've made my republican congressman uncomfortable once or twice in asking those questions, but he has been responsive to me, including returning my phone calls himself. I'm polite but firm when I speak with him, and I basically have my message and STAY ON MESSAGE in the conversations.
He and I may not always agree, but it gives me some satisfaction to know that he's going home at night realizing that not all his supporters are straight couples with 2.4 children. I hope that quietly, I'm making a difference, and that's something we all can do.