He easily won reelection because of the person he was running against. He also won because before he had created the new deal, which brought a lot of people jobs. People wanted him to stay because of his programs.
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D. The conviction of Communist conspirators in the U.S. Army
Senator Joseph McCarthy really kicked up Communist suspicion in high places in the government and this scared people, but once he started accusing military figures of conspiring with Communist Americans knew he wasn't for real.
John C. Calhoun supported the concept of nullification before the beginning of the Civil War. Nullification is the idea that US states have the right to ignore (invalidate) any law that they deem unconstitutional. This means that if a state thinks that a new law goes against a current constitutional amendment, they have the right to not follow it. The nullification crisis causes severe tension in Congress for decades leading up to the Civil War.