WASHINGTON (AP) – Elizabeth Warren is staying painstakingly neutral in the Democratic presidential contest – for now.

Candidates Hillary Clinton and Bernie Sanders would both love to win the endorsement of the populist senator from Massachusetts – especially with the important primary in next-door New Hampshire on Tuesday.

Warren is idolized by an army of liberal voters. And her longtime antipathy toward a financial system that she says is rigged against average Americans taps into one of this year’s dominant Democratic themes.

Many Democrats say Warren faces a complicated decision best addressed by letting the 2016 contest percolate longer. For now, she’s using her leverage to make her progressive agenda a guiding principle for the candidates.

Warren is the only one of the Senate’s 14 Democratic women who hasn’t endorsed Clinton.