The fight over President Obama's health care law is headed to the U.S. Supreme Court.

In March of 2010, Idaho Gov. Butch Otter was the first in the nation to threaten a lawsuit against the federal government over the law, which requires most Americans to carry health insurance, starting in 2014.

Idaho and about two dozen other states are now part of a lawsuit filed in Florida.

This constitutional challenge will be decided in the middle of the 2012 election campaign.

It's going to have political ramifications as well as legal ramifications. It's one of the big cases of history, said Paul Rothstein, constitutional law expert, Georgetown Law School.

The central question is can Congress force Americans to buy health insurance?

For the first time in 200 years, Congress is requiring every American to buy a product, in this case health insurance, or pay a fine, said Karen Harned with the National Federation of Independent Business. If this mandate's upheld, what is off limits? What under the Constitution can Congress not require each of us to purchase?

How far did Congress reach?

The Supreme Court for years has upheld various forms of insurance requirements, Social Security is a form of old age insurance, Richard Pildes, constitutional expert, NYU Law School.

The Obama administration requested the review by the high court.

We are confident law is constitutional, will be upheld as constitutional, said Health and Human Services Secretary Kathleen Sebelius.

And supporters hope hesitant states and health care companies will get in line if the court upholds the law.

I think they will find the individual responsibility provision constitutional. But if they don't, I don't think is going to have a major impact on the other provisions of the health reform legislation, said Ron Pollack, Families USA.

It will be a landmark showdown over a landmark law.

A decision would come by the end of June, still a few months before the presidential election.

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