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DENVER (Reuters) - Barack Obama launched an assault on Republican presidential rival John McCain on Thursday with a promise to reverse the economic failures of the past eight years and restore America's reputation in the world.

DENVER (Reuters) - A top contender to be Republican John McCain's vice presidential running mate abruptly canceled appointments in Denver on Thursday but it was unclear whether he was McCain's choice.

WASHINGTON (Reuters) - Vice President Dick Cheney in his first visit to Tbilisi next week will assure Georgia that the United States stands firmly with its ally which is reeling from a decisive military defeat at Russian hands.

WASHINGTON (Reuters) - U.S. Democratic presidential candidate Sen. Barack Obama could open talks with Iran on its nuclear program early next year if he wins the White House, one of his senior foreign policy advisers said on Thursday.

DENVER (Reuters) -- Al Gore, who lost the 2000 election but has become a world leader on the environment, was embraced at the Democratic Party's convention on Thursday as a comeback hero -- with a warning against John McCain and climate change.