Big data and elections: The candidates know you better than you know them

With the presidential nominating conventions looming, the candidates are getting ready to add to the hundreds of millions they’ve already spent to tell you about themselves — but only what they want you to know about themselves.

Meanwhile, they have also been spending millions of dollars collecting information about you — and you have no say in what is collected.

Which means that, in the era of big data, if you’re a potential voter, they know a lot more about you than you know about them.

The desire to know what will turn a voter to, or from, a candidate is not new, of course. Campaigns have been chopping up voters into interest groups for decades — minorities, gays, blue-collar workers, soccer moms, the religious right, progressives, boomers, NASCAR dads, union members, retirees, the rich, plus a host of occupational groups ranging from health care to law to the food and beverage industry.