What is it with delayed mergers and agreements today? I just reported about the DoJ beginning its investigation of Google-Yahoo. Now, Ars reports that, after imposing draconian restrictions on the new company, the government is still holding up the XM-Sirius merger. Senators are telling the FCC to wait to approve the merger until they can tack on even more stringent minority-ownership mandates. Will the merger ever be approved – or will XM and Sirius just give up after another 450 grueling days?