"When your attacks against your opponent feed the biggest weakness that you have...

...you are undermining yourself."

http://bigstory.ap.org/article/5ba783122da14454b5ef251c53d21f4c/clintons-frustration-grows-primary-race-drags

Sanders is drawing sizable crowds in New York, attracting 18,500 to rally in the South Bronx on Thursday. A victory in that state, which Clinton represented for two terms in the Senate, would deal a significant psychological blow to her campaign, rattling Democrats already worried about her high national disapproval ratings.

Clinton is more reliant on traditional fundraising than is Sanders, who's raised the bulk of his money online. Even as she prepares for New York's primary, she has scheduled fundraisers before then in Denver, Virginia, Miami and Los Angeles — at the home of actor George Clooney.

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Sanders adviser Tad Devine said the senator was not encouraging his supporters to disrupt Clinton's events and was focused on his own message. But he also said the campaign would respond when Clinton mischaracterizes Sanders' records and positions.

Her attacks, he said, only help Sanders. "When your attacks against your opponent feed the biggest weakness that you have, you are undermining yourself," said Devine.