La Times: “…Welcome to the new frontier of campaign tech — a loosely regulated world in which simply downloading a weather app or game, connecting to Wi-Fi at a coffee shop or powering up a home router can allow a data broker to monitor your movements with ease, then compile the location information and sell it to a political candidate who can use it to surround you with messages. “We can put a pin on a building, and if you are in that building, we are going to get you,” said Democratic strategist Dane Strother, who advised Evers. And they can get you even if you aren’t in the building anymore, but were simply there at some point in the last six months.

Campaigns don’t match the names of voters with the personal information they scoop up — although that could be possible in many cases. Instead, they use the information to micro-target ads to appear on phones and other devices based on individual profiles that show where a voter goes, whether a gun range, a Whole Foods or a town hall debate over Medicare. The spots would show up in all the digital places a person normally sees ads — whether on Facebook or an internet browser such as Chrome. As a result, if you have been to a political rally, a town hall, or just fit a demographic a campaign is after, chances are good your movements are being tracked with unnerving accuracy by data vendors on the payroll of campaigns. The information gathering can quickly invade even the most private of moments…”