PS - Which prominent Democrats are foreign policy realists? It seems to me that Democrats are either Wilsonian internationalists (the majority) or George McGovern-style pacifists (mostly a thing of the past). The only really prominent Democratic realist who comes to mind is the aging Zbiegnew Brzezinski. In contrast, in the GOP you have Wilsonian internationalists (neocons), realists (Reaganites), and “isolationists” (libertarians, paleoconservatives).
In the senate Feinstein and Nelson(FL). John Kerry. Joe Biden(joined at the hip with Lugar), Obama(Lugar was his mentor)(Zbig was Obama’s mentor at Columbia?), Leon Panetta. When you say Zbig, include Sam Nunn and Lee Hamilton with Zbig.