This assertion is accurate. The national parties often run the congressional campaigns to make sure the candidates support their platforms.
The main goal of a party is to win elections in order to exert control over governmental power and carry out its objectives; this objective sets parties apart from interest groups, who likewise aim to influence election results but do not formally field candidates for office.
Parties support candidates in running for office and then coordinate their actions once they are in. They find candidates, nominate them, and then assist them in winning the general election in order to gain office.
They do this so they may see where the two parties diverge. Voters find it helpful since it clarifies who holds what opinions and where they stand.
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