Seniority in the United States Senate is the value of a senator based on his/her service. There are two senators per state. The one senator that served more years is called the Senior senator. The one who served less is called the Junior senator.

• "United States Senate Periodical Press Gallery". Senate.gov. May 2011. Retrieved November 27, 2012.
• http://www.senate.gov/artandhistory/history/resources/pdf/chronlist.pdf

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