Here's part of his speech at the 1992 Democrat National Convention where he endorsed Bill Clinton:
"I know what Dan Quayle means when he says it's best for children to have two parents. You bet it is! And it would be nice for them to have trust funds, too. We can't all be born rich and handsome and lucky. And that's why we have a Democratic Party. My family would still be isolated and destitute if we had not had F.D.R.'s Democratic brand of government. I made it because Franklin Delano Roosevelt energized this nation. I made it because Harry Truman fought for working families like mine. I made it because John Kennedy's rising tide lifted even our tiny boat. I made it because Lyndon Johnson showed America that people who were born poor didn't have to die poor. And I made it because a man with whom I served in the Georgia Senate, a man named Jimmy Carter, brought honesty and decency and integrity to public service."
Yes. He's a YUUUUGE conservative.
He didn't like John Kerry on national defense. That doesn't make him a conservative.
Your question was he MORE conservative than some of the GOP, and the answer is YES, because some of the GOP are NOT conservative at all.