The following blog post from Randy Alcorn (author of Pro-Life Answers to Pro-Choice Arguments: Expanded and Updated) is the best article I've read so far on how we should come to grips with the current direction of our nation. I encourage everyone to read it. It helped to lift my spirits at a time when I thought nothing could.
See "It's Over, But It's Not Over (One Day It Will Be)". Pray, hope, and don't worry.