WASHINGTON — Four members of the Oath Keepers were convicted Monday of seditious conspiracy in the Jan. 6, 2021, Capitol attack in the second major trial of far-right extremists accused of plotting to forcibly keep President Donald Trump in power.The verdict against Joseph Hackett of Sarasota, Florida; Roberto Minuta of Prosper, Texas; David Moerschel of Punta Gorda, Florida; and Edward Vallejo of Phoenix comes weeks after a different jury convicted the group’s leader, Stewart Rhodes, in the mob’s attack …