Google and Microsoft took Capitol Hill Thursday as their rivalry spilled out during hearings on the Google's DoubleClick acquisition. Both parties have posted their prepared remarks before the Senate Subcommittee on Antitrust, Competition Policy and Consumer Rights Committee on the Judiciary. Here's a look at the backstory, Google's remarks and blog and Microsoft's testimony. So put on a little dueling banjos in the background and let's get to it. Economics and privacy: Brad Smith, Microsoft's general counsel, will argue that there are serious economic questions and consequences to consider around the Google-DoubleClick deal. His two biggest questions to ponder are: What are the economic consequences of allowing the Google to acquire its "most significant competitor," DoubleClick (all resources)? And...