Former Vice President Al Gore, seeking to shake up an energy debate that is focused mostly on drilling, challenged the United States to shift its entire electricity sector to carbon-free wind, solar and geothermal power within 10 years, and use that power to fuel a new fleet of electric vehicles.

The goal is the most ambitious energy plan by a major U.S. political figure - and one many energy experts say is unrealistic. Gore insists the only real obstacle is the reluctance of America's leaders to seek bold solutions to high energy prices and global warming. He likened his challenge to President John F. Kennedy's 1961 call to put a man on the moon.

"This goal is achievable, affordable and transformative," Gore told more than 1,000 cheering supporters at the Daughters of the American Revolution Constitution Hall in Washington. "It represents a challenge to all Americans in every walk of life: to our political leaders, entrepreneurs, innovators, engineers and to every citizen."

Gore is seeking to pressure the presidential candidates and Congress, which is in the middle of a fierce debate on energy policy. He said he has spoken to both Republican Sen. John McCain and Democratic Sen. Barack Obama about his ideas. Obama issued a statement Thursday saying he strongly agrees with Gore's goal.