Questions: Which of the following are the private-sector professionals and firms that sell the technologies, services, and strategies many candidates need to get elected? A. a media consultant B. an opposition researcher C. a campaign manager D. a campaign consultant

The answer is D. a campaign consultant

A media consultant is a professional who specializes in managing and strategizing a candidate's media presence, including advertisements and public relations. While they play a crucial role in campaigns, they are a specific type of consultant rather than encompassing all the technologies, services, and strategies needed for a campaign.

An opposition researcher focuses on gathering information about political opponents to use in campaign strategies. They are part of the campaign team but do not cover the broad range of services and strategies needed for a campaign.

A campaign manager oversees the overall strategy and operations of a campaign, coordinating various aspects such as fundraising, staffing, and logistics. However, they are typically part of the candidate's team rather than an external professional or firm selling services.

A campaign consultant is a private-sector professional or firm that provides a wide range of services, technologies, and strategies to help candidates get elected. They offer expertise in various areas such as media, polling, strategy, and more, making them the most comprehensive option among the choices.