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.

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