By Anjeanette Damon, Las Vegas Sun

Crossroads GPS, a conservative group co-founded by Republican strategist Karl Rove, has launched an expensive ad campaign in Nevada targeting President Barack Obama.

But there’s a noticeable gap in the ad buy.

Crossroads GPS is dark in Washoe County, Nevada’s pivotal swing county that could be the national turning point for the presidential election.

Why not go after Obama in the county that could determine his future in the White House?

Crossroads GPS refuses to shed light on the matter. Spokesman Nate Hodson said the group declines to talk about its specific strategy in placing ad buys.

But the answer could very well rest on the organization’s strong desire to keep its donors in the shadows.

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