By Naomi Kowles and Howard Hardee, News 3 Now and Wisconsin Watch Political misinformation and other misleading content has saturated social media in the weeks leading up to next Tuesday’s election, spread both intentionally and unwittingly. Like an oil spill, false information is difficult to stop — and hard to clean up. Political misinformation has appeared in the Facebook feeds of nearly two-thirds of voters in nine swing states, including Wisconsin, according to research provided by Avaaz, a global nonprofit that advocates on a range of issues, including corruption, poverty and climate change. A look at two such situations illustrates how this often happens and why corrections are so difficult. To read more of this in-depth look at the problem, click on the headline.