Obama is set to nominate appeals judge Sonia Sotomayor to the Supreme Court seat vacated by David Souter at press conference this a.m. Sotomayor has been a front-runner for several weeks and received some, er, enthusiastic critiques from legal observers, like TNR’s Jeffrey Rosen, who quoted anonymous law clerks to portray the Yale and Princeton grad as “not that smart.” Sotomayor made her way to the Ivies after growing up in a housing project in…