Via WaPo:

Sen. Charles E. Schumer (D-N.Y.) is formally entering the race to succeed Senate Minority Leader Harry M. Reid (D-Nev.), with allies suggesting he already has enough support to win what could turn into an uncontested race.

According to a person familiar with his planning, Schumer has already called most of his colleagues in the Democratic caucus following Reid’s surprise announcement Friday morning that he would not seek re-election next year.

A formal statement is expected Friday afternoon, but the Schumer adviser made clear that the race was the New York senator’s to lose. “He had the commitments from the overwhelming majority,” the source said.

The fast-moving race was effectively over before it really started, as Reid threw his full support behind Schumer in a Friday morning interview with The Washington Post. Later Friday Sen. Richard J. Durbin (D-Ill.), Schumer’s longtime rival to succeed Reid, told the Post that he endorsed Schumer in an early morning conversation on the Senate floor after he figured out that Reid was announcing his retirement.