Posted on Tue, May. 08, 2007 Martinez, activists spar over immigration BY CASEY WOODS Sen. Mel Martinez, stung by a national immigrant advocacy group campaign urging him to be more aggressive on immigration law reform, defended his work on the issue Tuesday.''It's disappointing there are groups out there ready to drive wedges and politicize this critically important issue,'' Martinez wrote The Miami Herald in an e-mail. ``I've been working since day one on this matter, and for clearly partisan groups to design a national campaign and put out advertisements signals to me that they're more interested in creating a...