Yeah. HW Bush is an outlier but he also came from a different social class than Pete or Ron, unlike them he was a scion of the Bush family. Class is something weird to talk about in the American context due to lacking the formal nobility with titles seen in the old world. Both of them are the equivalent of commoners while HW Bush was born an aristocrat. The Bush family even before HW Bush were both a political dynasty and wealthy, that goes a long way to getting what you want or being installed by others of your class as a steady hand if you are at least half competent.

Pete and Ron maybe are the type of nerds who really believed all the bullshit self-made from middle class family backstories both Clinton and Obama managed to sell the public. Which only worked for Obama because of the color of his skin and last name. Ironically the Obama birther conspiracy theory broke a lot of racists minds when they went really digging in Obama's family history and found he was related to a handful of recent presidents, sent them from pakistani illegal immigrant to Illuminati control everything type thinking. Anyway, family does matter and can open a lot of doors, even in the US where everyone is told there isn't a hereditary class system and all men are created equal.