Karen Handel, Republican candidate for Georgia's 6th Congressional District, speaks to supporters during a brief appearance at her election night party at the Hyatt Regency at Villa Christina in Atlanta, Georgia, US, June 20, 2017. [Photo/Agencies]

ROSWELL — Republican Karen Handel has won a nationally watched congressional election in Georgia and avoided a major upset after the most expensive House campaign in US history.Her victory over Democrat Jon Ossoff in Georgia's 6th Congressional District comes after Republican special congressional election wins in Montana, Kansas and South Carolina.Republicans are claiming momentum ahead of the 2018 midterms, but each race was much closer than expected for the four districts.Those trends leave Democrats hopeful they can win a House majority next year. They need to flip 24 GOP seats.The 55-year-old Handel is a former Georgia secretary of state who built her professional and political career after leaving an abusive home as a teenager. She succeeds Republican Tom Price, who resigned to join President Donald Trump's administration.AP