Why Republicans turn into Democrats, in other words.
They need $$$ so guys like Rubio sell out once elected to stay in power. The power and money become the point instead of whatever lofty ideals they had going in.
We’ve entered the post-democracy phase of American history.
Trump has confused the pundits, but he’s running as a traditional populist, appealing to the Reagan Democrats.
Notice the Teamsters may endorse him because of his Pat Buchanan-esque anti-NAFTA stance.
Some of them, like Rubio, are actually democrats pretending to be conservatives in order to get elected. They aren’t really turning into democrats. They always were democrats and are finally showing their true colors.
Rubio didn’t sell out after he got elected—he sold out so he could get elected.
Serious scholars of the Roman revolution and the advent of Caesarism and Empire would probably agree with you. Many of the problems of American democracy (which is now being "participated" in by Saudi plutocrats and KGB thugs supporting Manchurian candidates like Slick and Obama) can be traced to the now nearly-mechanical connection between access to cash and access to high public office.
For the record, Lyndon Johnson started the Democrats' practice of raiding the public treasury for thinly-disguised political money. Earlier operators simply stole it and spent it as their own.