Democratic presidential contender Elizabeth Warren is looking to break out at the second primary debate this week in Detroit. But the Massachusetts senator says she has no plans to sling arrows at 2020 opponents, particularly Bernie Sanders.

That’s a marked difference from the primary’s current front-runner, former Vice President Joe Biden, who recently promised to be “less polite” to another 2020 Democratic rival, Kamala Harris. The California senator vaulted back into the spotlight after attacking Biden at the first debate in Miami last month, over the former Delaware senator’s 1970s-era opposition to school busing and boasts of working with segregationist lawmakers.