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First, the Syracuse man repeatedly called a senator’s office in Washington and said he planned to kill former President Barack Obama, using a racial slur in his threat, the authorities said.

A year later, the same man, Stephen J. Taubert, called the California office of Representative Maxine Waters, a Democrat, and vowed to kill her and her staff members. Once again, he spouted violent rhetoric over the phone, using racist epithets .

On Tuesday, Mr. Taubert, 61, was sentenced to 46 months in prison for the phone calls.

His sentence was handed down in the Federal District Court in Syracuse. It came six weeks after a jury found Mr. Taubert guilty of threatening to kill a former United States president, transmitting a threat in interstate commerce and making a threat to influence, impede or retaliate against a federal official.

The jury also found that Mr. Taubert chose to make threats against Mr. Obama and Ms. Waters, two black Democratic Party leaders, because of their race, a distinction that allowed prosecutors to seek an enhanced sentence.