Who was the first woman to be elected to the US Senate?

Rebecca Latimer Felton of Georgia, the first woman to serve in the United States Senate.

The first woman elected to the Senate was Hattie Wyatt Caraway of Arkansas.

http://www.senate.gov/artandhistory/history/common/briefing/women_senators.htm

In 1932, Hattie W. Caraway, a Democrat from Arkansas, became the first woman to be elected to the U.S. Senate.

http://www.cnn.com/almanac/9801/12/

Good job, Mozart and SailRacer!

below from Mozart's link
Rebecca Latimer Felton of Georgia, the first woman to serve in the United States Senate, took the oath of office on November 21, 1922. Having been appointed to fill a vacancy, Felton served for just 24 hours. The 87-year-old Felton's largely symbolic Senate service capped a long career in Georgia politics and journalism.
The first woman elected to the Senate was Hattie Wyatt Caraway of Arkansas. Appointed to fill the vacancy caused by the death of her husband, U.S. Senator Thaddeus Caraway, Ms. Caraway then sought and won election on her own in 1932. She was reelected in 1938 and served until 1945.
To date, thirty-three women have served in the United States Senate, with fourteen serving at this time...