Is running an invisible campaign a sustainable campaign strategy?

Ace writes,

weirdly enough, both Bill Clinton and Chelsea Clinton have given interviews. But Hillary hasn't. Which is just bizarre. Has a candidate's spouse ever given an interview before the actual presidential candidate? I have not found another historical example of this.

But the truth is, Hillary Clinton is nothing if not calculating. Her internal polls must be suggesting this is a strategy worth pursuing. Clinton must believe her numbers will get worse if she dares to try to deal with the press or interact with those she calls Everyday Americans. Clinton's polls must show that her presidential prospects increase the less Americans see her.

Is running an invisible campaign a sustainable campaign strategy?

Meanwhile, The Hill reports,

President Clinton will not hit the campaign trail for Hillary Clinton in 2015, aides told The Washington Post, keeping in line with his promise to be a "backstage adviser" to her White House run.

"He's completely focused right now on the foundation," Tina Flournoy, President Clinton’s chief of staff, told the paper.

To which Ace responds,

My guess is this: Hillary is an extremely narcissistic and incompetent woman who, being a deluded, zealous feminist, wants to believe She Can Do This Without Her Husband, but in fact she's never done anything without the help of her husband.

So she tells him to take time off from campaigning for the easy part, the primary, while reserving the right to call in Her Man to Help Her during the general.

Another possibility is that the Clintons are trying to keep the Hillary Campaign, and the 10 years of huge graft at the Foundation for Clintons, sealed off from each other entirely; so Hillary will not answer questions about the Foundation for Clintons, and Bill will answer questions about the Foundation for Clintons (dishonestly and deflectively, but he will deign to answer), but won't talk about Hillary's campaign.

Read more here.