Wanniski, who invited Farrakhan to a conference last spring, argues that a Republican-nation alliance could guarantee an unbeatable electoral majority for the GOP.
Farrakhan participated in a conference last April. 
mnli hypothesis: Farrakhan participated in a conference last April.  premise: Wanniski, who invited Farrakhan to a conference last spring, argues that a Republican-nation alliance could guarantee an unbeatable electoral majority for the GOP.