Which consultant told Democratic candidates to refuse to say that they voted for Obama?

Because somebody did.

CHARLESTON, WV – Today, during an editorial board meeting with the Charleston Daily Mail, Natalie Tennant refused to say that she voted for President Obama in 2012. “I voted for the Democratic Party,” she said. She also, yet again, refused to say whether she would vote for Harry Reid as Majority Leader if elected to the Senate.

Yeah, I know, doesn’t matter because it’s West Virginia, but still. Somebody told Democratic candidates that they needed to be cowards. Who, and why?