Israel's enemies can't even see them coming.

Each of the five leading 2020 Democratic candidates can beat the president in a general election, according to the latest national match-up polls. But first, they will need to secure the party’s nomination in a hotly contested primary season that started with more than two dozen hopefuls. They're each using very different tactics to do so.Those five candidates — Joe Biden, Bernie Sanders, Elizabeth Warren, Kamala Harris and Pete Buttigieg — joined each other on Thursday night for the third Democratic debates, along with five additional candidates currently polling beneath them: Cory Booker, Andrew Yang, Amy Klobuchar, Beto O’Rourke and Julian Castro.