Staffers monitor and tweet from the first lady's account. Personal tweets from Obama are signed -mo.

Three quarters of White House staffers would stay home in a shutdown, the administration estimated on Monday.

There was no similar message from the official White House account, at least as of Tuesday afternoon.

The last tweet from it came Tuesday morning and noted: "Thanks to the House GOP, the government is shutting down. Thanks to #Obamacare, uninsured Americans can #GetCovered:"