Gillibrand, 43, had represented a congressional district near the state capital of Albany when she was appointed in January 2009 to succeed Clinton, who was named by President Barack Obama as U.S. secretary of state. Several well-known Democrats declined to challenge her in the primary and she coasted to the nomination.
DioGuardi, 60, who served in the House from 1985 to 1989, defeated fellow Republican David Malpass to win his party’s nod. His daughter, Kara, a singer-songwriter, was a judge on the Fox television network program “American Idol.”
Gillibrand will fill out the remainder of Clinton’s term and face the voters again in 2012.
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