They supported the political patronage system that was used to award civil service positions. Accordingly, they were opposed to any reforms that would use competitive exams or other means to award these positions based on merit.
I would say that "support to" is used to mean a literal support such as to hold up a roof. He added a steel brace to give more support to the roof. I would say "support for" to indicate approval for...
They were a large faction within the Republican Party's political machine who strongly supported the patronage system in the US government during the post Civil War period. When President Garfield...