OLDWICK, N.J. -- On May 5, 1996, when I was halfway through my first term as governor of New Jersey, there was a picture of me on the cover of the Sunday magazine of The New York Times, accompanied by the headline "It's My Party, Too." I liked that message so much, I had it framed and hung it in my office in Trenton and, later, Washington, D.C. To moderate Republicans like me, that headline proclaimed our belief that there was still room for us in the party of Lincoln. Now, almost eight years later, many moderate Republicans feel even...