WASHINGTON - Ahead of a contentious confirmation hearing, Democrats on Sunday sharpened their criticism of President Bush's nominee to be U.S. ambassador to the United Nations, saying John Bolton has a poor record as a policy-maker and little regard for the world body. But the chairman of the Senate Foreign Relations Committee, Sen. Richard Lugar (news, bio, voting record), R-Ind., said Bolton was the president's "instrument of reform" for the United Nations and his bluntness should not disqualify him from serving. Lugar said he would vote to confirm Bolton, but committee Democrats who appeared on the Sunday talk shows said...