Democrats said on Wednesday their U.S. Senate victory in Alabama could lead to a sweeping comeback for the party in 2018 elections, while Republicans sought to assess blame for a defeat in one of the country's most conservative states.

Doug Jones, a Democrat and former federal prosecutor, won the special election on Tuesday night after a bitter campaign that drew national attention amid sexual misconduct accusations against conservative Republican candidate Roy Moore.

President Donald Trump had endorsed Moore and the loss was a stunning upset for him and fellow Republicans, narrowing their majority in the Senate to 51-49. It also boosted Democrats who hope to retake control of Congress in elections next November.