President Obama has chosen appellate court Judge Sonia Sotomayor for the US Supreme Court. Sotomayor is to replace retiring Justice David Souter. If confirmed by the Senate, Sotomayor will become the first Hispanic to serve on the high court, and only the third woman. But her confirmation fight may not be easy. Republicans have indicated that they may attempt to block Obama's choice with a filibuster if they think that person is too liberal -- even though Democrats allowed Bush to appoint ultra-conservative justices John Roberts and Samuel Alito. Also, look for a continuation of the attacks against Sotomayor by anonymous sources.