CWmike writes: Advocacy group Consumer Watchdog called on (PDF) Wednesday for the DOJ to launch a broad antitrust investigation into Google's search and advertising practices and consider a wide array of penalties, including possibly breaking the company up. The watchdog, along with a mobile entrepreneur and two lawyers representing Google rivals, called for an investigation focusing on a number of issues, including Google's marriage of search results to advertising and its book search service. '...We think all remedies should be on the table, including, we think, the possible breakup of the Internet giant," said John Simpson of Consumer Watchdog. Adam Kovacevich, senior manager for global communications and public affairs at Google, discounted the criticisms, saying Consumer Watchdog has been 'relentlessly negative' about Google. The group recently questioned the reasons why Google stopped censoring search results in China, and criticized Google's privacy Dashboard as inadequate, Kovacevich said.