WASHINGTON _ They can't ignore Donald Trump forever.
With the exception of a few tweets and barbed asides, the Democratic presidential candidates have spent the opening weeks of the 2020 campaign avoiding talking much about the man they aim to unseat, instead casting their own campaigns as forward-looking and positive.
But at a moment when the Democratic base is united in its determination _ and desperation _ to defeat Trump, some voters and activists are also looking for tactical details on how, exactly, these candidates plan to win in a one-on-one battle with the president.
