Actually, there have been several studies that demonstrate that republicans go out of their way to spread disinformation. For example, people who watch Fox News know *less* about current events that people who don't watch any news programs at all.
Googling for 'conservative stupid study' will give you article after article
The thing is, it's not about whether Democrats are good and Republicans are bad. Everyone seems to be under this assumption that Democrats=liberal and Republicans=conservative. In actuality, Democrats=center leaning conservatives, and Republicans=psycho theocrats that make Mahmoud Ahmadinejad look rational.
The Democrats most closely correlate with the conservatives of the 60s-80s. They're hardly perfect, and they have their own moments of self-serving garbage. But Republicans? They actively *scare* me. They are hell bent on persecuting everything that isn't white, male, and rich, and heterosexual. And that persecution goes up exponentially as you take away more of those elements. They have not only consistently voted against *anything* that would help the average American, but they have repealed existing laws that help, especially when it comes to womens rights.
As one example: The Democrats implemented one of the single most important pieces of legislation that helps fix the horrific mess that is the US health care system. It has been clearly demonstrated now that not only do many Americans now have access to health care that they didn't have access to before, but it has decreased overall health care costs. The Republicans have been trying, and continue to try, to repeal the ACA for no logical reason whatsoever.
Republicans are railing against Obama for *not* being enough of a war-monger. They collectively deny basic science like evolution. The list just goes on and on. It's not that Democrats are good. It's that the Republicans are *insane*.