Imagine how he feels with all of the "OMG ROMNEY DID X Y AND Z" threads.
Exposing he truth is not propaganda. If you want threads about Romney's lies and hypocrisy to go away from the web, write Romney and ask him to stop lying and flip-flopping so damned much.
Having said that, Obama's hands are clean. He's not a liar nor a flip-flopper. You can find some contrary quotes or policies over Obama's career, and probably one clear flip, but as Durkheim said, deviance is relative and will even be found in a society of saints. What angers many Americans is the extremes to which Romney flip-flops and lies, how often he does it, and how easily he does it.
Since Obama's hands are so clean, Republicans must create myths about him. These Jeep ads are a good example. Despite the big auto makers (the experts in this situation) saying that Romney is a liar, his ads claiming that Obama sold Chrysler is not only dishonest, but impossible (Obama coudn't sell Chrysler even if he wanted to).
It's not about truth, it's about what sounds good to the unenlightened voters and how it's presented. Romney is a very good presenter of both truths and lies. In the first Presidential debate, he dictated truths and lies with the same aggressive force and confidence. Unfortunately for Romney, who seems to be a luddite, intelligent Internet users are well aware of his 180-degree flip flops and lies.