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A poll called "Misinformation and the 2010 Election" was conducted by WorldPublicOpinion.org, based at the University of Maryland, and Knowledge Networks, right after the 2010 elections.
The poll found that voters were substantially misinformed on many key issues.
The misinformation was correlated with how people voted and their exposure to various news sources such as CNN, Fox News, MSNBC, PBS, Network TV news broadcasts, and Newspapers.

Some findings of the poll:

Republicans wrongly believe that:
The American economy is still getting worse.
Economists have concluded that the health care law will increase the deficit.
The stimulus legislation did not include any tax cuts.
Most scientists do not agree that climate change is occurring.
Obama was born in the US or it is not clear whether or not Obama was born in the US.

Democrats wrongly believe that:
It was proven to be true that the US Chamber of Commerce was spending large amounts of foreign money to support Republican candidates.
Obama haas not increased the troop levels in Afghanistan.
When TARP was voted on, Democrats did not mostly favor it.

Both Democrats and Republicans wrongly believe that:
Income taxes have not gone down during the Obama administration.
The stimulus saved or created only a few jobs, or caused job losses.
The bailout of GM and Chrysler was not something that took place under both Presidents Bush and Obama.

Viewers of Fox news are the most misinformed of any news consumers.
The study also found that as exposure to Fox News increased, so did the misinformation.

Those who watched Fox News almost daily were significantly more likely than those who never watched it to believe that:
Most economists estimate the stimulus caused job losses.
Most economists have estimated the health care law will worsen the deficit.
The economy is getting worse.
Most scientists do not agree that climate change is occurring.
The stimulus legislation did not include any tax cuts.
Their own income taxes have gone up.
The auto bailout only occurred under Obama.
When TARP came up for a vote most Republicans opposed it.
It is not clear that Obama was born in the United States.
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Do not argue with an idiot. He will drag you down to his level and beat you with experience.