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In page Vote Smart:

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The response to the Political Courage Test has dropped, from 72% in 1996 to 48% in 2008[3] and even further to 20% by 2016,[4] because politicians from both parties are afraid that challengers will use their responses out of context in attack ads, according to The Wall Street Journal. Rep. Anne Gannon, Democratic leader pro tempore of the Florida House of Representatives, stated: "We tell our candidates not to do it. It sets them up for a hit piece." In response, Vote Smart has tried to shame politicians into it, and lets them leave up to 30% of answers blank.[5]