Disheartened that the Valerie Plame affair has gone nowhere fast, and that Karl Rove has not been found to have broken any laws, the Democrats are now fixing their sights on John Bolton:

WASHINGTON — Two of Washington's most contentious political issues of late have collided — the nomination of John Bolton to be U.S. ambassador to the United Nations and the investigation into who leaked a CIA operative's name to the press.

Democratic Sen. Joe Biden (search) of Delaware, who opposes Bolton's nomination, faxed a letter to Secretary of State Condoleezza Rice on Wednesday asking if it was true that Bolton was called to testify to the grand jury about who leaked the name of Valerie Plame yo reporters. If Bolton did testify, some Democrats say, he should have amended his response to a questionnaire filled out for the Senate Foreign Relations Committee.

Biden might have slightly more credibility if he would publicly ask Ambassador Joe Wilson why he lied about who sent him to Niger. But if the Democrats wish to keep fruitlessly pursuing this story, while embracing a known liar, by my guest.