IIRC, anyone can come to NH, claim intended residency (or something like that) and register as whatever you want.
The Masshole migration has certainly tainted the political waters from the Live Free Or Die state, so .. polls and such don't mean anything to me.
It’s a Open Primary in which Dems vote and decide
Our candidates !
Which Is exactly how Romney, Rnc, and DC elites planned it!
You will see loads of cars with Massachusetts and Maine plates at the polling places in NH on Primary Day...draw your own conclusions.