That's the case according to a 2016 statement by Seymour Hersh. Hersh also says that therefore the US may have been able to change its policy towards Israel had Sanders been elected.
This is something, I guess, you know, a forbidden statement, but he's the first Democrat since I've been watching politics 50-[something] (I'm old, older and crankier than Bernie, but anyway) it's the first Democrat that I can remember that actually did not have to go to the Jewish community in New York to get money to run. And that's something amazing. We may able to actually change our policy and let the Israelis know that's there's gonna have to be a settlement [...]
So, given that framing, is it true with respect to US elections (I guess Democratic primaries) in the past 50 years or so?