The political wrangling surrounding the nomination of Eric H. Holder Jr. for attorney general appeared to end Tuesday with his most vociferous Republican critic pledging to back President Obama's choice to lead the Justice Department. Sen. Arlen Specter, Pennsylvania Republican, said he will support Mr. Holder, 58, when his nomination comes to a vote Wednesday in the Senate Judiciary Committee, which virtually ensures it will be approved by that committee. "I think that Mr. Holder is entitled to the benefit of the doubt in the context of the excellent record he has," said Mr. Specter, who is the top Republican...