Neville Chamberlain entered into talks with Hitler to try and guarantee a peaceful conclusion to Germany's land grabs. After the Reinland and Sudatanland (territories that were given up by Germany as war reparations) were taken back and Northern Checkoslovakia (pro German to some extent consisting of many Germans sympathetic to the Nazis) and Southern Checkoslovakia followed, all without much of or any fight I might add. Hitler made promises he didn't intend to keep that he was not going to press further. Which came to naught when he invaded Poland, and kick started the war.
I don't think it's fair to compare that to Israel and Palestine though. Hitler had been amassing a colossal war machine, one that Britain was ill equipped to fight at the time. Britain rightly feared the Germans and although Chamberlain probably went too far, the idea itself was a sound one. So it's not exactly as if Obama is faced with some sort of dilemma or is trying to appease a powerful state. Plus of course the accusations are pretty much fabricated in the first place. I've not seen Obama pressing for appeasement at all myself, this is lousy propaganda and mud slinging. It's perhaps one of the worst analogies I've ever heard. And you shouldn't really be bad mouthing presidential candidates in foreign speeches anyway (and yes we all know who you were referring to) That's a definite faux pas. I don't think Obama's going to get much dirt on him from this.