Could a Trump nomination cause an exodus of moderate Republicans?

[Erc]

Clearly it depends on a host of other factors, age and geography among them.

Many in the northeast whom one would normally describe as "moderate" are clearly on board with Trump--Giuliani, Christie, etc.  Voters who vote mainly on law & order issues, white ethnic voters, and so forth.

Young voters (those under 30, and, to a slightly lesser extent, those under 40) are especially ill-disposed towards Trump, and it's here where I would expect to see the largest flakeoff towards Hillary.  Obviously, Hillary has had her own struggles with the younger vote, but that's something she'll solve by the election.  Whether this means youth turnout will be in the dumps or whether it will be strongly pro-Hillary (or some combination) is unclear.

Personally, I'm voting for Hillary in the fall, though admittedly I'm not very representative, as a McCain 2008 / Obama 2012 voter.