• by Wendy Davis , Staff Writer @wendyndavis, January 20, 2016

Political campaigns try to serve targeted ads online, but are challenged by cookie deletions, says Tim Cameron, chief digital strategist at NRSC. "Match rates might be 40% on a good day," he says.

But, he adds, it's equally important -- if not more important -- to reach the other 60%. "Just because they clear out their cookies doesn't mean they're not voting," he says. In fact, he adds, "the type of people who take the time to clear out their cookies" probably are even more likely to vote.