FDR scholars: Why was Henry Wallace dumped from the '44 ticket?

[DerekG]

I confess I have little admiration for Harry Truman: I find Gore Vidal's argument--that Truman is ultimately responsible for the destruction of our republic--very convincing. It was Truman who opened Pandora's Box in Hiroshima and Nagasaki, it was Truman who decided that we *not* demilitarize and revert back to a peacetime economy (Canada, anyone?), and it was Truman who created the CIA and gave us the National Security Act.

Which leads me to Henry A. Wallace. I find it curious that FDR's vice-president, true heir to the New Deal, fierce anti-fascist (google his assessment of fascism, sometime) and future critic of America's role in fomenting the Cold War was dumped from the ticket--especially at a time when FDR's declining health was quite noticeable.

Did the Democratic party bosses have a vested interest in our future empire--and its enticing fruits? Or am I reading too much into this? Was Wallace cast aside for something so innocuous as being "unelectable?"

Scholars, history buffs...chime in!