NBC - All eyes are on the highest court in the land this week.

The Supreme Court is expected to rule on the constitutionality of President Obama's landmark health care law as early as today.

The high court will also hand down judgment this week on Arizona's tough immigration law.

With these critical issues coming to a head this week they are certain to play heavy on the campaign trail.

A new Reuters poll shows that a majority of Americans oppose President Obama's health-care law-although they support most of its provisions, such as letting parents keep their children on their policies until age 26.

But 61% say they are against the "individual mandate," which forces Americans to purchase medical insurance.

The Supreme Court is expected to rule on the law as early as today. "If the court strikes down the mandate or indeed the whole bill, I think it will be a political disaster for the administration," said the Wall Street Journal's Peggy Noonan.

How the court's decision is framed politically could ultimately influence the November election. "The Supreme Court finds itself in the middle of a storm. A political storm, in the presidential election that's coming up, because it's the president's signature achievement and this is about health care, which touches all of us," said Supreme Court Expert Tom Goldstein.

Congressional Democrats are defending the health care bill's achievements. "I believe most Americans will say, we're never going to go back to those days where my child could be denied access to my health insurance because he or she had a preexisting condition," said Xavier Becerra, (D) California.

The hot button campaign issue of immigration is also on the Supreme Court's docket --- a widely watched judgment on Arizona's tough immigration law could be handed down sometime this week. "Arizona has an all-out border problem there that's not just about immigration. It's about security. And its legislature, frustrated with inaction from the federal level, reacted with this law," said Senator Marco Rubio, (R) Florida.

But it's the health care decision alone that makes it the most important week of the campaign.

If the court rules against the law, political experts say it's hard not to see it as a rejection of a major part of President Obama's first term in office.

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