1979, shortly after Iran's leader Shah Mohammad Reza Pahlavi fled the country, Iranian opposition figure Ayatollah Ruhollah Khomeini ended his 14-year exile in France and returned to Iran to establish an Islamic Republic, largely hostile to American interests and influence in the country. In the spring and summer of 1979, inflation was on the rise and various parts of the United States were experiencing energy shortages. Carter was widely blamed for the return of the long gas lines in the summer of 1979 that was last seen just after the 1973 Yom Kippur War. He planned on delivering his fifth major speech on energy, but he felt that the American people were no longer listening. Carter left for the presidential retreat of Camp David. "For more than a week, a veil of secrecy enveloped the proceedings. Dozens of prominent Democratic Party leaders—members of Congress, governors, labor leaders, academics and clergy—were summoned to the mountaintop retreat to confer with the beleaguered president." His pollster, Pat Caddell, told him that the American people simply faced a crisis of confidence because of the assassinations of John F. Kennedy, Robert F. Kennedy and Martin Luther King Jr.; the Vietnam War; and Watergate. On July 15, 1979, Carter gave a nationally televised address in which he identified what he believed to be a "crisis of confidence" among the American people. This came to be known as his "Malaise speech", although Carter never used the word in the speech. Many expected Senator Ted Kennedy to successfully challenge Carter in the upcoming Democratic primary. Kennedy's official announcement was scheduled for early November. A television interview with Roger Mudd of CBS a few days before the announcement went badly, however. Kennedy gave an "incoherent and repetitive" answer to the question of why he was running, and the polls, which showed him leading the President by 58–25 in August now had him ahead 49–39. Meanwhile, Carter was given an opportunity for political redemption when the Khomeini regime again gained public attention and allowed the taking of 52 American hostages by a group of Islamist students and militants at the U.S. embassy in Tehran on November 4, 1979. Carter's calm approach towards the handling of this crisis resulted in his approval ratings jump in the 60-percent range in some polls, due to a "rally round the flag" effect. By the beginning of the election campaign, the prolonged Iran hostage crisis