I must quibble with this. FDR is the worst President ever.

• Price controls
• Wage controls
• Created the Social Security Ponzi scheme that hangs like a $75 trillion albatross around our necks
• Crazy government spending that prolonged the Great Depression
• Ignored Washington's wise advice to avoid entangling alliances (especially in Europe)
• Worked hard to get us into a war against the will of the public
• Illegally imprisoned 100,000 Americans in concentration camps without trials (planned for this in 1936, 5 years before WWII)
• Buddied up to Stalin and sent him tons of military equipment, ultimately leading to communist oppression of much of Europe for five decades
• Abused the Constitution's "Commerce Claus" to expand federal government power almost limitlessly
• Threatened to pack the Supreme Court to get them to rule in favor of his many unconstitutional policies
• Ignored Washington's wise advice to only serve two terms and elected to four terms, making himself a near dictator who left only due to death, leading to enough fear of his centralized power that both Democrats and Republicans got together to pass a two-term limit Constitutional amendment

To be clear, I'm no fan of the current administration or any recent administration, but FDR's evil is hard to beat.