Eric Alterman is the sort of liberal we like to refer to as a "Democrat," as in, capitol "D" Democratic Party stalwart. As such, this Nation columnist and Media Matters blogger was an arch-partisan prototype for those crazy kids at DailyKos, back in the days when armchair politicos were relegated to penning rants to the editor of their local newspaper. In advance of his appearance tonight at Town Hall to promote his new book, Why......