I’ve examined this race in every possible way, and I keep returning to the same fundamental conclusion: If I run, the likely result would be a brutal and highly negative Democratic primary — a primary where the winner emerges weakened and the Republican strengthened.

I refuse to do anything that would help Republicans win a Senate seat in New York, and give the Senate majority to the Republicans.

I realize this announcement will surprise many people who assumed I was running. I reached this decision only in the last few days — as I considered what a primary campaign, even with the victory I saw as fully achievable, would have done to the Democratic Party.