WASHINGTON – Conservatives stepped up their criticism of Supreme Court nominee Sonia Sotomayor on Tuesday, but it was unclear how far Senate Republicans were willing to go to create bumps in what appears to be a smooth road to confirmation for President Barack Obama’s first high-court choice. Even as the Senate’s top Republican suggested that Sotomayor let racial bias cloud her rulings, he and other GOP senators refused to say whether they would accede to conservative activists’ demands to try t