Based on the excerpt below I can guess who one of the two NYT sources are:
Representative Steve J. Israel, Democrat of New York, also called on Mr. Weiner to step down, saying that he clearly needed to seek treatment for “inappropriate behavior.”
“I pray for his family and hope that Anthony will take time to get the help he needs without the distractions and added pressures of Washington,” Mr. Israel said.
At the same time, two senior Democratic officials said on Saturday that Mr. Weiner was planning to check himself into a treatment center.
With friends like the Democratic leadership who needs enemies?
Updated with statement:
“Congressman Weiner departed this morning to seek professional treatment to focus on becoming a better husband and healthier person. In light of that, he will request a short leave of absence from the House of Representatives so that he can get evaluated and has determined that he needs this time to get healthy and make the best decision possible for himself, his family and his constituents.”
From Jake Tapper's Twitter:
Senior D official on Weiner leave of absence: "That is unacceptable...the die is cast..he needs to move on."