I didn't mean in my original comment that technology is entirely useless. More that it's a distant second to the things that have always worked in politics, and that "our tech is worse than theirs" is the refuge of a losing party looking to cast blame for their losses.
Republicans are usually a middle aged male female team. They are very polite and will discuss the election in general before admitting who they represent. They will also try to sway with fiscal voting histories and moderate policy choices.
Democrats will usually be a group of twenty year olds or middle aged teachers. They are pleasant, but immediately hand you the flyer and start to discuss 'stopping' this or that. They usually don't talk about their candidate, but discuss negatively the competition and Republican national level platform concepts and of course recently Trump. The majority of flyers they send out are negative campaigns.
There is one campaign this year and the only ads running on TV right now is a negative ad against the Republican because he voted against funding bills that claimed to support some senior citizen project and schools. I honestly think this is a smooth play on the Republican party to keep quiet.
Reading this made it seem to me that this tech can be extremely effective. By pinpointing exactly who was worth their time talking to (i.e. if husband of target answers the door you ask for target otherwise politely leave) the Koch brother's were able to overturn an initially very popular public transit bill.