The House of Saud is the biggest batch of feudalists that exist upon this planet. They do not have any ongoing relationship with either major US political party. Instead they maintain a customer/supplier relationship with their largest customer, a contemptuous one that also sees them funding fundamentalist Islam on multiple fronts. They do not care at all which US party is in the White House, their basic desire is to destroy the Great Satan, along with those of all secular so-called "Democracies" around the globe, in the process replacing our political system - and that of every Judeo-Christian nation - with a Caliphate.
The second largest group of feudalists I know of is the American Democratic Party, the British Labour Party, etc. As I have pointed out many times in these pages, the Democrats run an inclusion scam while actually being severely Racist. This situation has existed for almost a century and a half, after the founding of the GOP by Lincoln. The political pendulum swings right/left in a fairly regular rhythm, the present leftward swing began with the "Camelot" series of reforms begun by the imperial Kennedy/Shriver family, replacing the ultra right wing Dixiecrats with nominal social liberals. The second largest "Imperial Presidency" was that of William J. Clinton, the greatest one in the history of this nation is that of Barack Obama. (Third I would place FDR, and it isn't until 4th that you will find a GOP Imperialist member - Teddy Roosevelt.)
Although you have an admirable vocabulary, your political viewpoints are mired in a simplistic Liberal/Good vs. Conservative/Bad set of delusions - both major American political parties have a complex set of memberships spanning the ideological spectrum from left to right, and approximately 45% of the American electorate. Such delusions typically arise in people who were excessively exposed to that most dysfunctional yet oddly ignorant of American ideological groups - the Liberal Academics. That group is a persistent international one and has included a couple of entirely delusional members named Karl Marx and Friedrich Engels, who published the most ignorant of manifestos.
The 10% of non-ideological voters decide every election in the USA, the only more numerous group in the country is that of the infamous "silent majority" - that class of people that have never voted, and would not be doing so now had their severely curtailed Middle Class incomes not overcome both their desires never to serve on a jury and never to be registered for a system of military conscription we actually abandoned decades ago. (Their attitudes persist in the face of reason - and are exacerbated in our cybernetic society.)
That's the other thing you personally do not understand - that mobile electronic devices and a worldwide information network are now replacing all our other societal paradigms - and that the fantasies of Marx and Engels, which were never actually realized or proven in whole or in part - have already been replaced by an entirely new set spawned by Gates/Jobs/Zuckerberg. Humans are less than one generation away from becoming cybernetic organisms, with direct access to to the WWW and a hive mind enabled by WiFi interconnects. The ultimate class struggle is not Liberal/Conservative, Rich/Poor, Republican/Democrat, or any other divide you have ever contemplated, it will simply arise in a single unanticipated day, when those with direct mind/machine interfaces realize that they are the dominant species on Earth, and exterminate the others - those without cybernetic brain implants, the new Neanderthals. SkyNet will be born in a single day, and the world will be bathed in nuclear fire, and the new species of cyborgs will exterminate all the traditional, non-networked humans.