The Slog and the PI  are both reporting that Sims has not accepted a job in the Obama administration. From the PI:  

"No, it's not true," Sims spokeswoman Natasha Jones said in a phone call, even before the question was asked.

She said Sims denied the report when pressed about it by staffers late Thursday.

Sims' office did not return my phone calls this morning nor did Sims return my inquiry to his Facebook account about the story.