http://www.foxnews.com/politics/2012/04/02/obama-confident
-supreme-court-will-uphold-health-care-law/
excerpt:

Obama on Monday said that without such a mandate, the law would not have a mechanism to ensure those with preexisting conditions get health care.
Read more: http://www.foxnews.com/politics/2012/04/02/obama
-confident-supreme-court-will-uphold-health-care-law/#ixzz1qw0ASVdY
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http://www.pbs.org/newshour/rundown/2012/03/what-is-the
-individual-mandate-and-what-if-its-declared-unconstitutional.html

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The federal gov't already offers pre-existing health care ins until 2014 under the health care law.

http://www.healthcare.gov/law/features/choices/pre-existing
-condition-insurance-plan/index.html

http://cciio.cms.gov/programs/pcip/index.html