The difference is there wasn't an organized rightwing media machine in place to give legitimacy to those accusations like there is now. Those agencies have been instrumental in backlash management over the past 30 years and a main part of the reason left wing policies can't gain traction today despite the blatant failures of rightwing policies over that same time period and the multitude of examples of effective left policies in other countries. But the more these agencies are forced to associate with and defend the more extreme policies of the right the less legitimate they look in the eyes of reasonable people. And that machine is going to have to lose legitimacy in the eyes of the average person before we can begin to move left even back towards center. Fortunately with the likes of Beck, Limbaugh, and Fox all on the decline that seems to be happening but we're not there yet.
I agree the creation of the right-wing media machine has been important, but unfortunately I don't see it increasing the backlash like you do.
Instead, the right-wing media machine with its funding is the dominant one in the country - there is little left-wing media in comparison. The right reportedly is 90% of talk radio.
Air America shut down, MSNBC is a careful experiment after trying to out-right Fox didn't makemoney - and they cut anchors who try to be 'too left', like Olbermann and Uyger.
The right-wing media remains a heavy influence in the US and doesn't seem to be going anywhere, not its think tanks that dominate the 'experts' mandatory on shows.
Everyone is bombarded from the Heritage Foundation, AEI, and Cato.
The right-wing media can adjust its message as needed - it'll be there, pushing to the right however left or right the national politics are.
And there's a vicious cycle that the higher the concentration of wealth, the more wealth the rich have to put into their own interests, in media sponsorhip, contributions, etc.
This is why Obama was such a lost opportunity, why we needed another FDR and not a 'moderate' who wouldn't fix things in response to the economic crash.
Instead we're continuing with the problems since post-Reagan, if the Republicans had put up a decent candidate they could have won the presidency, and Obama's support largely comes by moving to the right as a Democrat to appeal to 'moderates' rather than leadership for liberal policies moving the country to the left.