Directly from the NRA website: "While widely recognized today as a major political force and as America's foremost defender of Second Amendment rights, the NRA has, since its inception, been the premier firearms education organization in the world." Most of the history of the NRA is to support training, safety, marksmanship, and hold matches and events. The focus on political lobbying is a recent development mostly happening after Charleton Heston resigned.
As a paying member, I certainly have the right (and obligation) to criticize the leadership if I am not getting the gun-related programs the NRA is supposed to be doing. Organizations are organizations of people, and this case citizen-members. I am not the only one who has been critical of NRA leadership. There have been many within the organization and governing board who have been openly critical and attempted to remove LaPierre.
If I want to have Obama removed from office, I have plenty of political organizations working to do that. Defeating Obama is not going to help make progress on gun rights....that needs to be done at the State and Local level. And, while they are distracted on the election, the primary purpose of the organization is not being sufficiently funded and managed: Training, safety, marksmanship, and a focus on States with unreasonable gun laws, etc.