As a British A Level Modern History student, I know that the British Parliament came together in a National Government, or a coalition of all parties during World War 2 and with the exception of a few minor disagreements they stayed pretty much united until Germany's surrender in 1945.
I also know that the German Reichstag was united under the Nazis (albeit a forced unity), also both the Japanese and Soviet governments were united in their support of the war effort.
This supports a basic premise that these nations put everything they could toward the war effort, to the extent that ideology and philosophy was irrelevant in most cases.
However I do not know about the USA during this time. We hear a lot about the strong leadership of FDR and Truman, However we rarely (in Britain anyway) hear anything about Congress during this time.
Were the parties united?
I feel from my knowledge of the US system, that the parties would have carried on with partisan politics and ignored much of the war as it was happening to far away for many of them to care, but I can image that certain commitees would have been involved, (Senate Armed Forces, Intelligence etc.).
During WWII, did Congress show solidarity with the President?