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The administration has effectively extended the March 31 deadline for enrolling in Obamacare. The Loop hasn’t. The deadline for entries in the contest — “Guess Obamacare’s final first-year enrollment number” —  is still noon Friday, March 28.

Simply guess how many people will enroll by the original deadline, Monday, March 31.  The 10 entries closest to the actual number will get a coveted Loop T-shirt and lifetime bragging rights.

Send entries — only one prediction per person — by noon March 28 to intheloop@washpost.com. Subject line: Obamacare.

Be sure to provide your name, profession, mailing address and T-shirt size (M, L or XL), in case you’re a winner. You must also include a phone number — home, work or, preferably, cell — to be eligible.