There are several reasons that Methodists are ignored. First, reporters instinctively understand that mainline church officials rarely command and direct the political and social opinions of their constituencies. Voting patterns and polls show this, but most reporters can figure that out even without the data. Secondly, Methodists are kind of bland. Baptists are at least entertaining when they want to be.
Catholics are good at shows and ceremony.
Though fewer in number, Episcopalians are able to grab attention with their combination of liturgical pomp and squabbles over sex. But Methodists usually provide all the drama of a Rotary Club luncheon. There are few things more middle American and therefore less exciting than a Methodist. Third, statements from United Methodist bishops and other church officials on political issues are not just reflexively liberal. They are often inarticulate and sometimes downright nonsensical.