How had "The Battle Hymn of the Republic" been important during the war?

Howe's more famous lyrics were written in November 1861 and first published in The Atlantic Monthly in February 1862. The song links the judgment of the wicked at the end of the age (through allusions to biblical passages such as Isaiah 63 and Revelation 19) with the American Civil War.

i believe that the answer to the question provided above is that the role of campaign committees is to act as a bridge between state and local campaigns.