In the Iowa poll, they also asked this question…
Is there any candidate who you would refuse to vote for in the general election?
Trump 20%
Bush 14%
Cruz 11%
Rubio 8%
Paul 7%
Carson 5%
Fiorina 5%
Huckabee 5%
Christie 5%
Kasich 5%
Santorum 5%
Gilmore 4% (Gilmore confirmed as most electable GOP candidate)
LOL. The poll didn't have a "not sure" category for this one?
48% of GOP caucus-goers say they'd support any of the GOP candidates in the general election. The remaining respondents named at least one of the GOP candidates as someone they wouldn't support in the GE. Though some of them named more than one person, so it appears to add up to more than 100%.