SOCIALIST PARTY IN TURMOIL. Last fall, the Socialist Party-USA nominated retired Oregon State Senator Walt Brown as its Presidential nominee for 2004. Brown -- a former Democrat -- was the most mainstream of the democratic socialists contenders in last year's nomination fight. More strident Marxists in the party opposed Brown, but were not able to block him. Now, months later, a vocal faction in the party is trying to force Brown from the ticket because of his views on the abortion issue. The SP-USA platform is solidly pro-choice, and without exceptions. Brown, it turns out, personally supports the ban on...