Not really... but there is (or, rather, was?) something very much like it.
Um, PJ? That was a joke...
But now that we're on the subject, while not really a "vast right wing conspiracy", it's a pretty well accepted fact that a very conservative wing of the Republican party known as Neo-Conservatives have been waging a rather well orchestrated campaign to push the country pretty far right since the 70's or 80's through organizations such as the Federalist Society, the Christian Coalition, the American Enterprise Institute, and so on. You can get more details at the wiki page:
http://en.wikipedia.org/wiki/Neoconservatism
While developing a wide-spread ideology and then trying to turn that into an agenda to change a nation isn't new, as is usually the case, the conservatives are far more organized and effective at it than the liberals. And the neo-cons have been have been almost shockingly good at it over the last 20 years or so. They've made tremendous gains. Here's just a few examples:
1) They've expanded the power of the Executive branch over the other two quite a bit to the point where Bush is making liberal use of "signing statements" on bills that effectively say he can ignore the law if he wants to, and executive orders that are at such volume as to be arguably keeping pace with the Legislature in making laws.
2) They've dramatically changed the face of the judiciary from the Supreme Court all the way down to the lowest federal courts as well as some state court systems through Executive and other appointments to the bench into one that interprets the law and the Constitution in a very, very conservative way.
3) They've greatly reduced governmental transparency and accountability. The amount of times they've refused to turn over documents or information to the Legislature, independent investigators or even the Justice Department itself is staggering. And they're mostly getting away with it.
4) They've set us back many decades in having a bit of high ground in the human rights arena through our covert prison camps, our refusal to give these so-called "enemy combatants" any form of due process, and increasing the leeway with which the government can spy on it's own citizens with impunity to a level that probably exceeds the levels achieved in the pre-Viet Nam era.
5) They've essentially neutered the EPA and done everything short of repealing the Clean Air & Water Act and the Endangered Species Act. Steven Johnson's refusal to grant California the right to restrict emissions beyond the federal guidelines over the stringent objections of every single person in his Department is the latest example. And the bastard still has his job. They've also put off any significant action on global warming in part through systematic editing and censoring of the government's top scientists. In fact, the clever weasels even managed to turn the issue into a windfall for their corporate farming buddies by creating new subsidies for corn to support an increase of ethanol usage that most experts on the topic say is a waste of time and money and may actually contribute to global warming rather than reduce it! And don't even get me started on the idiocy that is "clean coal technology". Jeez...
6) Through re-making the country's legal system, they've struck blow after blow to the labor unions with several key, pro-management rulings.
7) The pre-emptive strike foriegn policy doctrine they put into action with the invasion of Iraq is a HUGELY aggressive change for the country that should not be underestimated. That we would invade them under such flimsy, and ultimately concocted, premises with the hubris of not just influencing change in another country but out-and-out hand crafting their government ourselves is probably very troubling to the rest of the world and should be to us citizens. We've basically said "we can invade anyone we want and there's nothing you can do to stop us". eek.
and so on...
The bright side (if you're not a new-conservative, that is) is that they just may have pushed the envelop too far. On the dark, dark day that was November 3rd, 2004, I told myself and anyone that would listen, "this next 4 years will give them just enough rope to hang themselves". While it's way too early to call that prediction, I'm cautiously optimistic...