is, first of all - technology. Information spreads almost instantaneously now - both true information, allegations and propaganda.
This works both ways - both in terms of information coming towards "we the people" and information going back to "the powers that be" by means of focus groups and polls that may or may not be accurate. More than ever before, "the powers that be" rely on this information from focus groups and polls to determine policy rather than their own principles
Also "communications scientists" know much more today about how to manipulate people's choice and opinions through use of linguist and sublimial technologies than ever before.
While it is true that politicians and others have always tried to utilize techniques and tools such as these, today's level of technology has given them unprecedented power in these areas.
Second, the corporate-owned single-slant media is new. There used to be a multitude of privately owned newspapers. You could read newspapers from a wide variety of perspectives. Today, journalist standards have been tossed overboard in exchange for "being the first out of the gate" and those people who are not actively searching out information are being spoon-fed a lot of mis-information, propaganda and opinion in the guise of information.
Third, the amount of money being paid to corporate lobbyists in unprecedented, as is the involvement of lobbyists in actually writing legislation. While corporations have always had a lot of influence on government, particularly during the Gilded Age, I believe we have never seen the extent of influence corporations have on government before.
Additionally, the extent that these corporations are multi-national is unprecedented. By their very nature, these corporations have less allegiance to one country over another. Their allegiance is to the source of their profits.
Corporations priority on short-term profit is unprecedented. Never before the past 20 years or so, have corporations been intent on their own short-term growth. Technology has made things like out-sourcing and automation available to them, allowing them to lose their dependance to local workers.
I had one other point but had a phone call in the middle of my writing this post and now it's slipped my mind!!!! Darned!!!
Anyway - I mostly agree with you that history repeats itself and there are similaritis from the past to what we are seeing today. But I also think some things are new.
Edited to add this link to a post about "neuro-marketing"
http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=104x3789740