He was looking for someone with the ability to win over Justice Anthony Kennedy, the crucial swing vote.

“[Obama] was very struck, when he met with her, about how thoughtful she was as a judge,” says the source. “He believed she had a precise approach to cases that would be effective in winning over Kennedy when possible.”

The president considered Sotomayor’s opinions to be “rigorous, precise, not overly flamboyant.” Reports have called her more workmanlike than visionary – a precision that impressed Obama, who is looking to turn narrow decisions his way.