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U.S. President Barack Obama hugs a woman after he speaks about the Affordable Care Act in the Rose Garden at the White House in Washington

U.S. President Barack Obama hugs an American the White House says will benefit from the opening of health insurance marketplaces under the Affordable Care Act, after speaking in the Rose Garden of the White House in Washington, October 1, 2013. The U.S. government began a partial shutdown on Tuesday for the first time in 17 years, potentially putting up to 1 million workers on unpaid leave, closing national parks and stalling medical research projects. REUTERS/Larry Downing (UNITED STATES - Tags: POLITICS BUSINESS HEALTH TPX IMAGES OF THE DAY)

New insurance marketplaces

For millions of Americans trying to log in, the online insurance marketplaces created by the new health care law began with a stalled website, an error message or a menu that didn't work.

But the debut of the new insurance marketplaces might have been a victim of the law's own success. The initial sign-up day appeared to draw heavy interest that suggested pent-up demand for just the kind of coverage now being offered. (AP)