Mark Tooley, here:
The collapse of Methodist social influence in America began with its greatest political victory: Prohibition. After Prohibition’s repeal, Methodism first began to lose in its share of American population, and then later in absolute numbers, all the while becoming politically less and less relevant. Presidents Roosevelt, Taft and Wilson all spoke to Methodist governing bodies during the lead-up to Prohibition, after which another president never again addressed a Methodist juridical convention. In the 1950s, Bishop Bromley Oxnam was exasperated when the Methodist bishops met with President Eisenhower, who offered only a photo op, and no interest in hearing their views. Oxnam was not discouraged from pursuing other channels of political influence for his denomination.