The Politico article about the video ad, explains:
That such a high-profile group as Crossroads is entering the fray on the public employee fight illustrates both how important conservatives see the debate and, as Wisconsin Gov. Scott Walker’s numbers fall, the degree to which they want to re-focus it on public labor’s political contributions and union stereotypes - and away from whether workers should have the right to organize.
The ad campaign buy is $750,000 over one week, with spots running on CNN, CNBC and Fox News.
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