“Thank goodness FDR let Wallace be replaced.”
‘Let’ is not the right word.
Let is not the right word.
In those days, the Democrat Party actually had conservatives and Wallace had shown himself to be unpalatable as the next President. It is very hard to believe that anyone could not see FDR and not fear/know that he would not serve out this 4th term. That his ego and cadre around him would use the "War Necessity" to go for it was close to criminal on their part. The damage done with his failing health and mentality, especially with Stalin, was enormous!
Let is not the right word. Let me clarify. My only source in this is my old copy of David McCullough's TRUMAN, FDR told Wallace that he was his choice for VP, but the choice at that time was not FDR's alone to make obviously. FDR could have put up a real fight for Wallace but was convinced by his advisors not to. But letting it be thrown entirely to the convention and not doing more than making a basic statement that he would vote for Wallace were he one of the delegates, FDR let Wallace be replaced by Truman.