I wonder how many Republican votes went to Bernie in a cross over vote.
You can not do that in NH.
NH is a closed Primary.
The only way you get a choice for either is if you are Undeclared/Independent.
Then when you are done voting you have to change back or you are now one or the other.
There was some guy whining on the local Facebook page about exactly that. He was an Independent four years ago and voted in the Republican primary. Then FORGOT to change back before October of last year. He wanted to vote in the Dem primary this time and could not. All the stupid people on FB were all saying that was not fair, blah, blah, blah.