Republican officials are blaming tonight's GOP losses on Democrats, who they claim have engaged in a wide variety of 'aggressive, premeditated, anti-Republican campaigns' over the past six-to-18 months. 'We have evidence of a well-organized, well-funded series of operations designed specifically to undermine our message, depict our past performance in a negative light, and drive Republicans out of office,' said Republican National Committee chairman Ken Mehlman, who accused an organization called the Democratic National Committee of spearheading the nationwide effort. 'There are reports of television spots, print ads, even volunteers going door-to-door encouraging citizens to vote against us.' Acknowledging that the 'damage has already been done,' Mehlman is seeking a promise from Democrats to never again engage in similar practices. 