IOWA CITY, Iowa Massachusetts Sen. Elizabeth Warren s campaign has plenty of well-known slogans: Ive got a plan for that. Two cents! Big, structural change! Dream big, fight hard!

And for reporters looking for her comment on rivals for her partys 2020 presidential nomination, Warren has another slogan: Im not here to attack other Democrats .

Warren has deployed the line again and again over the past 11 months to decline comment on other candidates approaches to governing, their policy proposals and even their attacks on her. But with her campaigns poll numbers plateauing, two moderate rivals stepping up their explicit and implicit attacks on her and a billionaire entering the race, Warren has begun to occasionally counterpunch.

Yet Warrens campaign, which has been setting traps for other candidates on campaign finance since its very first days in the race, remains wary of unleashing full-bore assaults on her competitors. Democrats in the early states still want the candidates to play nice, and some allies remain uneasy about how the media portrays women who attack their opponents.