WASHINGTON, Sept 13 (Reuters) - Democratic presidential contender Hillary Clinton, who led a failed attempt to change the U.S. health care system during her husband's presidency, on Monday will lay out new health care proposals she would pursue if elected president.

Clinton's 1993-94 proposals would have required employers to provide health insurance coverage to all employees through closely regulated health maintenance organizations.

The insurance industry led the opposition to the proposals, and the plan's collapse was a bitter reversal for President Bill Clinton, who had put his wife in charge of developing the initiative.

Now leading Democrats in polls for the November 2008 presidential election, Hillary Clinton plans to outline her proposals in Des Moines in the early voting state of Iowa.

"Obviously, I hope the headline is that, you know, Hillary is back, and we're going to get it done this time, because we tried and were not successful in '93-'94," the New York senator told a presidential forum sponsored by huffingtonpost.com.

From her last attempt, she said she learned it is essential to build a political consensus on such a sweeping issue.

"A plan is necessary but not sufficient. We've got to have a political consensus in order to withstand the enormous opposition from those interests that will have something to lose in a really reformed health-care system," she said in remarks to the forum made public on Thursday.

She provided no details about her proposals. Improving the health care system and providing coverage to some 48 million uninsured Americans is a top domestic issue ahead of next year's elections.

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