Gives new meaning to the backdoor between voter data bases first reported by the Sanders campaign and later used to smear the Sanders campaign.
Maybe it wasn't about soliciting donations from the the other side. A charge I always found ludicrous, who could be tricked into supporting another candidate during the primary? Upon winning the full data base would be available to the winner.

However if you were more interested in flipping registrations..................

with electronic registrations, electronic poll books, electronic vote counting and electronic vote reporting...ANYTHING is possible

the VAN lists would have all the info needed...the dnc with it's close connection to hc control all of that BUT

a good hacker from the repubs could gain entry too or some foreign hacker

<shrugs>

the main point is until WE THE PEOPLE get to oversee every phase of our own elections,

it is all a trust me system

and followup by checking your registration and verifying your registration before your state caucus or primary asap.