JEROME ARMSTRONG AND MARKOS MOULITSAS are pioneers. Armstrong founded MyDD.com, arguably the first political blog of real prominence. As for Moulitsas, he's the founder and proprietor of Daily Kos, by far the most widely read of all political blogs. Pioneers they may be, but neither Armstrong nor Moulitsas has developed a reputation as a particularly skillful prose stylist.Yet their new book, Crashing the Gate: Netroots, Grassroots and the Rise of People-Powered Politics, is a crisp and well-crafted work. The authors sharply diagnose the Democratic party's ills in a blunt and entertaining fashion.Less impressive is the political philosophy they espouse. Crashing...