The Republican Party 's popularity after the victory in the Spanish – American War led Weaver , for the first time , to doubt that populist values would eventually prevail . With the demise of the Populist Party , Weaver became a Democrat and was a delegate to the 1904 Democratic National Convention . He was displeased at the party 's nominee , Alton B. Parker , whom he thought " plutocratic " , but Weaver supported his unsuccessful campaign nevertheless . He gave serious consideration to running for the House again that year , but decided against it . In 1908 , he supported Bryan 's third campaign as the Democratic nominee for president , but it , too , was unsuccessful
1904 Democratic National Convention
1904 Democratic National Convention
James B. Weaver