I don't think I've ever met anyone who had this idea. Why would anyone think this?
Wasn't FDR (Franklin Delano Roosevelt) a democrat? It was FDR who made the move to engage the USA into World War II ostensibly to battle Hitler although by the time we got going Japan had attacked us and this became the true reason. But many Jews look up to FDR and then the democrat party.
I am surprised you have not heard about this... Much has been written about it. I do believe that FDR did not love Jews at all, and rather he had to do something to show his Jewish constituency that he was concerned.
http://www.amazon.com/Saving-Jews-Franklin-Roosevelt-Holocaust/dp/1560259957What was once a controversial, revisionist view of the U.S. role in the Holocaust has recently achieved disturbingly wide acceptance. That view asserts that the Roosevelt administration, including FDR himself, was indifferent to the fate of European Jewry, motivated by crass political concerns or even outright anti-Semitism. Rosen has written a passionate, well-researched, and convincing response. The most troubling accusation, that of anti-Semitism, is refuted by the unprecedented participation of Jews in the upper echelons of the Roosevelt administration, as well as Roosevelt's personally warm relations with many Jews. Roosevelt had spoken out forcefully about Nazi persecution of the Jews since the late 1930s, and with the death camps in full operation, he made it clear that Nazi leaders would be held accountable. Rosen also deals effectively with other controversial actions, including the refusal to bomb railroad lines leading to the death camps. This strong, counterrevisionist work will not end the debate, but it will help balance the scales. Jay Freeman
Copyright © American Library Association. All rights reserved --This text refers to an out of print or unavailable edition of this title.
This is the site for the book..
http://www.savingthejews.com/http://www.thenation.com/article/175315/fdrs-jewish-problem
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It’s a scene that I have seen play out with minor variations many times over the last decade at similar public events about the Holocaust. No matter the evidence to the contrary, it has become received wisdom among many American Jews that Roosevelt deliberately and coldly abandoned Europe’s Jews in their hour of need.
This marks a dramatic reversal in the image of a president who won more than 80 percent of the Jewish vote in all four of his successful campaigns, who surrounded himself with Jewish advisers and was portrayed by Hitler’s propagandists as Jewish (and not in a good way). Roosevelt brought thousands of Jewish professionals into government, prevented Hitler from overrunning Britain and Palestine (thus saving their large Jewish populations), chose to fight Germany first after the United States was attacked by Japan, and paved the way for New York’s first Jewish governor and senator.
Presidential scholars have consistently ranked Roosevelt as the best chief executive in the nation’s history for his handling of the Great Depression and World War II. But even among liberal Jews who still hold him in high regard for those achievements, his reputation has been tarnished as he has been viewed increasingly through the prism of the Holocaust. What started out in the late 1960s as legitimate historical revisionism—looking critically at what the Roosevelt administration and American Jewry did during the Holocaust—has morphed into caricature, with FDR often depicted as an unfeeling anti-Semite.
This historical debate has a significant contemporary subtext, one that helps explain the intensity of the passions it still arouses. That subtext is today’s debate among American Jews about Israel. In recent years, the distorted view of FDR has been promoted by a small group of Israel supporters who cherry-pick the historical record to portray his handling of the Holocaust in the most negative light possible. These scholar-activists deploy similar sleight of hand to paint a picture of most American Jews as having been disengaged and apathetic about the fate of their European counterparts at the hands of the Nazis, and to cast as heroes a small group of right-wing Zionists who mounted an aggressive public relations campaign to pressure Roosevelt to act. In this narrative, the complexities of history are erased and the passage of time is unimportant. The not-so-subtle message: like the Jews of Europe in 1939, Israel is under an existential threat and cannot count on anyone for help—even the United States, even liberals, even Jews in the United States, most of whom are insufficiently committed to Zionism. Betrayal happened before, and no matter how friendly a president or a country may appear to be, it can happen again.
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The Jewish vote went to the Democrats for a long time after that...
Here is a table containing the % of Jewish vote per party since 1916...
http://www.jewishvirtuallibrary.org/jsource/US-Israel/jewvote.html