Imagine, for a second, that you're Sirius Satellite Radio (Nasdaq: SIRI - News). You've spent the last three quarters swiping market share from your only rival. You landed the top dog in terrestrial radio and now Howard Stern is exclusively on your coast-to-coast airwaves. Your product is an easy sell as you lap the 5 million subscriber mark. Your automaker partners keep ramping up the number of

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