Each of them tries a different angle. Livni practically only talks about her leadership skills (joke as it is) and her ability to push forward with the piece process, and of course incite against the settlers. Yachimovitch doesn't talk at all about security and foreign affairs, only populist socialist propaganda. Yair Lapid, who is in rality a wealthy smug well connected gigolo, is trying to pretend he is the champion of the middle class and he incites against the Haredim.
They are in reality one and the same leftist block and all of them has as their main priority to dismantle settlements and hand out everything to the Arabs.