I think the sophisticated targeting is part of it, sure. But I also think it is because of the hold neoliberal thinking now has on the industrial democracies. Moderates who are repelled by the right don't feel comfortable voting for a left that they don't feel is sufficiently on-board with neoliberalism, so they'll vote for the right at times out of a belief that the "left" - even when "left" is Labour or the Democrats, hardly leftist parties - is inherently unfit to govern. At the same time, the crises and dislocations that neoliberalism creates mobilize more people to oppose it, creating high turnout and very close elections.
This phase won't end until the left has found a way to revive its fortunes, assert a clear agenda that opposes neoliberalism, and find a way around a deeply hostile media establishment. And the world will live as one
{1. ... though most just saw him as a crazy old coot} I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.