What is the main job of the congressional campaign committees? - to stage national conventions for presidential candidates - to lobby members of congress to adopt party policies - to fund the campaigns of those seeking state offices - to reelect party office holders and capture new seats

The correct answer is "to reelect party office holders and capture new seats". Congressional campaign committees are political groups dedicated to support the campaigns of their respective political parties, to recruit candidates to capture new seats in the congress, and to reelect party office holders when needed. Basically, congressional campaign committees work to make sure that the candidates for elections in their respective parties are the best for their political party.

- to reelect party office holders and capture new seat

Explanation:

The National Congress parties' campaign committees have as their main task to ensure the re-election of congressmen and, if possible, to advance further by increasing the number of elected congressmen. That is to say, a successful committee can re-elect politicians and reach seats that were previously percentile to congressmen from another party.

It is important to note that in the American democratic system it is very important to get the largest number of congressmen elected to base the government, if the president is from the same party, or to make an opposition if the president-elect is from the other party.