Still, Medicare administrator Mark McClellan said that by Monday, coverage could reach a milestone.

NPR: Medicare Drug Deadline Looms with Millions Unsigned

News reports over the weekend said Mark McClellan is set to offer his resignation as early as today.

NPR: Medicare Chief Reportedly Ready to Step Down

Even Mark McClellan, a Bush-appointed predecessor in the CMS job, supports his nomination.

ECONOMIST: Health-care reform

Alas, explains Mark McClellan of the Brookings Institution, the most meaningful proposals have since been watered down or delayed.

ECONOMIST: Health reform in America: Signed, sealed, delivered | The

And if the name sounds familiar, Mark McClellan is the older brother of former White House Press Secretary Scott McClellan.

NPR: Medicare Chief Reportedly Ready to Step Down

Medical economist Mark McClellan held the job for less than 18 months before being shuffled off to deal with fixing Medicare.

FORBES: FDA Fix No. 1: Pay Up

At a recent conference, FDA Commissioner Mark McClellan admitted that device approvals were still taking too long, while approvals for drugs were speeding up.

FORBES: Medicine's Two-Headed Watchdog

FDA, Mark McClellan, an economist on the Council of Economic Advisers.

ECONOMIST: Drug side-effects

Dr. Berwick -- I doubt if Dr. Berwick was a supporter of whatever theory that is supposed to be, that Mark McClellan and Tom Scully, the previous CMS administrators for the Bush administration, would support his nomination.

WHITEHOUSE: Press Briefing