FDR's justices were allies while he was alive, but after he died, they developed four totally different theories of what the Constitution is, two of which are considered conservative and two of which are considered liberal.
Roosevelt got a chance to name an amazing nine justices of the Supreme Court. He was not namby-pamby on this question. He wanted people who shared his views, he wanted liberals, and he wanted lots of them.
To hear both critics and defenders talk about the fitness of Judge Sonia Sotomayor for the Supreme Court, you'd think the most successful Supreme Court justices had been warm, collegial consensus-builders. But history tells a different story.