This is the headline of a CBS News story posted on 7 April 2016:

Bernie Sanders: I attacked Hillary Clinton because she attacked me

The title implies that Bernie Sanders actually made that statement.

It attempts to establish that Bernie Sanders attacked Hillary Clinton.

Here’s the actual statement from Bernie Sanders:

What I said was in response to what she has been saying. Washington Post headline, quote, “Clinton questions whether Sanders is qualified to be president.” I thought it was appropriate to respond.

He never characterized his actions as an attack on Hillary. It was a response to a baseless attack on him, and his response included facts about Hillary Clinton’s record on various important issues.

When Bernie Sanders and others quote Hillary Clinton’s record, it only sounds like ‘negative campaigning’ because her record is, indeed, negative.