Many Republicans changed their registration in the Iowa primary to vote for Bernie Sanders, the weakest of the two Democrats to almost give him an upset win in Iowa but not out of love or loyalty for him.
This how it works. In Delaware you can only vote in a primary you are registered with, Democrats voters for Democrats, Republicans for Republicans; Independents can’t vote for either.
In Iowa as late as Election Day you could change your registration. I have a friend who formerly worked and lived in Delaware, now works and resides in Iowa. She worked the election yesterday.
On her FB page she stated many Republicans and Independents were changing their party affrication to Democrat to support Sanders not really for him but against Hillary Clinton.
Republicans don’t want Hillary Clinton as their opponent in the November Election. So you vote for Sanders who cannot win against any of the three top Republicans and hope he wins the delegates and goes on to be the Presidential nominee. Take away those votes and Hillary would have won by a larger margin.
It’s an old political trick which has been used many times. And it almost worked. A loss would have been a disaster for the Clinton campaign.
A Sanders win would have given him great momentum in the next state New Hampshire where he trails Clinton by a large margin. A win yesterday would have meant $$$$ to his campaign.