>> so when do people ultimately make that decision, do you think, to potentially drop out? >> so that's -- each candidate has different thresholds, and that relates to what their family's endurance of this punishing, grueling, nasty enterprise is. it relates to their donors, and it also relates to their own economic situation. aloft these guys don't have inherited wealth. those that have to make a living at a certain point have to decide how much longer can i be out here doing this and when do i have to do what scott walker did, go back to my day job and serve out my term because it's not happening. >> chris stirewalt, thank you, live from milwaukee. for first time in more than a year, president obama and israeli prime minister benjamin netanyahu are meeting face to face. netanyahu droching by the white house to talk about tensions between israel and pallen steen. over 50 people have died recently. the two talked about the threat of isis and the nuclear deal