WASHINGTON, Nov. 7 - The McCain-Feingold law, which did more to change how American political campaigns are financed than any legislation since the 1970's, got its first real-world test in this year's election. And now its critics are more emphatic than ever in arguing that the law has fallen short of its goals, and even some supporters are calling for revisions. The 2002 law demolished the system that for more than a decade had allowed political parties to feed on unlimited soft-money contributions from companies, labor unions and donors. But what rose in its place remains the subject of fierce...