The only truly open-minded mass group of people are the radical moderates, who, unfortunately, have no political party, because we all know that dogmatism is what sells.
You can't sell a politics of "rational analysis" to the masses, who require explanations in 140 characters or less.
One of my greatest fears is that we will see our society continue a polarization route, wherein liberals and conservatives are further divided, with very little common ground. I blame this on the media at large, but "populist" social media in particular, which reduces vastly complicated social and natural phenomena to buzzwords and slogans - and any dumbass with an Internet connection is allowed to participate, only dumbing down the dialogue and creating further social fractures among the populace in the process.