The final fifteen months of Carter's presidential tenure were marked by several major crises, including the Iran hostage crisis, serious fuel shortages, and the Soviet invasion of Afghanistan. Ted Kennedy, a prominent liberal Democrat who protested Carter's opposition to a national health insurance system, challenged Carter in the 1980 Democratic primaries. Boosted by public support for his policies in late 1979 and early 1980, Carter rallied to defeat Kennedy and win re-nomination. In polls of historians and political scientists, Carter is usually ranked as a below-average president. Federal budget deficits throughout Carter's term remained at around the $70 billion level reached in 1976, but as a percentage of GDP the deficits fell from 4% when he took office to 2.5% in the 1980–81 fiscal year. However, because economic growth outpaced the growth in nominal debt, the federal government's debt as a percentage of gross domestic product decreased slightly, from 33.6% in early 1977 to 31.8% in late 1980.
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