Washington (CNN) - Arizona Rep. Gabrielle Giffords has won a third term in the U.S. House over Republican Jesse Kelly, leaving just eight congressional races still undecided.
Kelly, an Iraq war veteran and Tea Party favorite, conceded to Giffords late Friday, saying in a statement, "We are blessed by God to live in a nation where we get the government we deserve and the government that we chose. The voters of Southern Arizona have spoken and I respect their decision."
Giffords received 49 percent of the vote, while Kelly received 47 percent.
Giffords faced a tough challenge from Kelly in Arizona's Republican-leaning 8th District, which went for Sen. John McCain in 2008, and George W. Bush in 2000 and 2004.
The tight race prompted MSNBC host Keith Olbermann to donate $2,400 - the maximum allowed - to Gifford. Olbermann also donated $2,400 to the campaign of Rep. Raul Grijalva, who faced a similar challenge in Arizona's neighboring 7th district. Grijalva narrowly defeated Republican Ruth McClung.
Olbermann also donated money to Kentucky Democratic candidate Jack Conway's campaign, and has been suspended indefinitely for violating NBC's ethics policies.
–CNN Political Research Director Robert Yoon contributed to this report