I agree. The last two on our side. But the last four are going to be Trump, Cruz, Bush and Rubio. One of those four will be the nominee.
In the poll, these are how the general election match-ups go, of the ones they asked. Margin of victory over the Democrat is shown:
Clinton:
Carson 4
Bush 1
Trump TIE
Rubio TIE
Fiorina -1
Kasich -3
Cruz -4
Huckabee -7
Biden:
Carson 3
Rubio -5
Fiorina -6
Trump -8
Sanders:
Carson 11
Fiorina 6
Rubio 4
Trump TIE
Carson is obviously the strongest.
For some reason, Fiorina and Rubio outperform Trump against Biden and Sanders, but Trump is right on par with them against Clinton.
Trump does terribly against Biden. Biden must be appealing to a similar low-income, less-educated demographic slice.