MONTPELIER, Vt. - Former Vermont U.S. Sen. James Jeffords, who in 2001 tipped control of the Senate when he quit the Republican Party to become an independent, died Monday. He was 80. Jeffords died in Washington, said Diane Derby, a former aide to Jeffords. He had been in declining health, she said. Jeffords had announced in 2005 that he would not seek a fourth term, citing his and his wife's health problems.