Former U.S. Senator Jim Jeffords of Vermont passed away today at the age of 80. When he was first elected to Congress in 1974, New England Republicans were well represented in Washington, DC, and were more progressive than many southern Democrats in the Capitol. By the time he retired in 2006, only a few Congressional Republicans hailed from states to the north and east of New York.

Jeffords will be most remembered for becoming an independent in May 2001, shifting control of the Senate to Democrats just a few months into George W. Bush’s presidency. Emily Langer notes in her Washington Post obituary that Jeffords had been out of step with his party on many occasions before then.

In 1981, while serving in the House, he was the only Republican to oppose President Ronald Reagan’s tax cuts. Later, as a member of the Senate, Mr. Jeffords opposed President George H.W. Bush’s nomination of Clarence Thomas to the U.S. Supreme Court and publicly agonized before supporting the president on the invasion of Iraq during the 1991 Persian Gulf War.

During the Democratic administration of President Bill Clinton, Mr. Jeffords broke with his party by backing the president’s health-care plan and voting against the articles of impeachment brought against him in connection with the Monica Lewinsky affair.

Even so, leaving the GOP caucus was a difficult choice for Jeffords. You can watch his May 24, 2001 speech here or read the transcript at the Burlington Free Press website. Iowa’s senior Senator Chuck Grassley was among the GOP colleagues most hurt by Jeffords’ defection. Speaking to reporters on that day in 2001, Jeffords said his meeting with Republican senators had been

the most emotional time that I have ever had in my life, with my closest friends urging me not to do what I was going to do, because it affected their lives, and very substantially. I know, for instance, the chairman of the finance committee has dreamed all his life of being chairman. He is chairman about a couple of weeks, and now he will be no longer the chairman. All the way down the line, I could see the anguish and the disappointment as I talked.

So many elected officials have remained loyal to parties that no longer represent their views. It’s hard to redefine one’s political identity and jeopardize longtime relationships. Jeffords stands out because he took a painful step for principles he believed in.

Incidentally, Grassley focused on the policy implications of Jeffords’ switch, not his personal loss of power. As it happens, he didn’t have to wait long for another chance to chair the Senate Finance Committee, from January 2003 through December 2006.