 Complete the following phrase:  Howe entered publicly into the antislavery struggle for the first time in 1846 when, as a Conscience Whig, he was an unsuccessful candidate for Congress against Robert C. Winthrop. Howe was one of the founders of an antislavery newspaper, the Boston Daily Commonwealth, which he edited 18511853 with the assistance of his wife Julia Ward Howe. He was a prominent member of the 