Mondale at the time, Gus Hall in retrospect.
Voting for the CP after 1932 is basically voting Democratic anyway, so its not like it would be a real big difference.
Going from Communism to liberalism (in the us) is a pretty big difference. Why would voting CP be like voting democrat after '32?
Because from 1935 onward the CP tacitly supported the New Deal as part of the "Popular Front" policy, which basically said that you had to support the Democrats at any costs to prevent the election of an 'extreme Right' Republican. Sure, the CP ran candidates, but they were basically implicitly offering a message to 'vote for Roosevelt', in spite of a minor flip flop in 1940-41 before the Soviet Union got invaded by the USSR.
The modern CP is no different. It endorsed John Kerry in 2004 and has endorsed Obama in 2008 and in 2012.