Hillary Clinton gets another primary challenger:

Former Rhode Island Gov. Lincoln Chafee joined the race for the Democratic presidential nomination on Wednesday, with a campaign in which he is expected to challenge front-runner Hillary Clinton on her foreign policy record.

Like that of the other challengers, Chafee’s entry into the race is welcome news in spite of the near-certainty that he isn’t going to win any primary contests. Clinton may be the prohibitive favorite, but that makes it all the more important that she be forced to answer for her record and be held to account for her serious errors in judgment. Chafee’s decision to focus on Clinton’s foreign policy record makes sense, not least since he was the sole Republican member of the Senate to vote against authorizing the Iraq war in 2002 while Clinton voted for it. Like Webb and Sanders, Chafee can legitimately call Clinton out for her vote to authorize the invasion of Iraq.

While the Iraq war offers the most obvious and significant contrast between the two, Chafee would do well to challenge Clinton on the entirety of her foreign policy record in order to show that her misjudgment on Iraq was part of a pattern of taking reliably hawkish, interventionist positions on virtually every major issue. He should force her to defend the disastrous Libyan war, and he should press her on her support for sending weapons into Syria. It should give Democratic voters pause that Clinton consistently and predictably sides with hawks in foreign policy debates, and the more challengers Clinton has to point this out to them the better-informed primary voters will be.