Is There a Future for Sirius XM?

The satellite radio operator is a Berkshire Hathaway holding.Sirius XM (SIRI -5.42%) is a Berkshire Hathaway holding: The Warren Buffett conglomerate owns 37.1% of the company's outstanding shares, so the Oracle of Omaha might see something he likes about the company.Berkshire's apparent endorsement, though, doesn't change the fact that Sirius XM's share price has dropped by 59% over the past five years. Its valuation is now quite cheap, at a forward price-to-earnings ratio of 7.4 -- which might pique the i ...