John Kerry has decided not to run.

I sought the presidency to lead us on a different course. There are powerful reasons to want to continue that fight now. But I've concluded this isn't the time for me to mount a presidential campaign. It is the time to put my energy to work as part of the new Democratic majority in the Senate, to do all I can to end this war and strengthen our security and our ability to fight the real war on terror.

The people of Massachusetts have given me an incredible privilege to serve in the Senate, to represent the birthplace of freedom, the cradle of liberty, and a state where in Faneuil Hall patriotic dissenters stood on principle. I want to continue representing Massachusetts, and that's why I am running for reelection so I can use my voice all day every day to end this war and galvanize grassroots action to force Washington and our Democratic Party to live up to its responsibility.

(Fortunately for the YouTube Generation, most of whom are tragically unable to read, Kerry also made a video.)