Comcast filed a 175-page “public interest statement” with the Federal Communications Commission on Tuesday to explain why its proposed $45.2 billion purchase of Time Warner Cable will be good for consumers. The country’s largest cable and broadband Internet provider is already meeting opposition in its quest to buy the second largest cable provider, however. As Comcast prepares for a Senate Judiciary Committee hearing scheduled for tomorrow, more than 50 public interest groups “submitted a letter to FCC Chairman Tom Wheeler calling a market takeover of this scale ‘unthinkable’ and urging the agency to block the deal,” said an announcement from consumer advocacy group Free Press. “The coalition delivered the same letter to Attorney General Eric Holder at the Department of Justice, which is also charged with reviewing the merger.”