"I trust, that your readers will not construe my words to mean, that I would not have gone to a 3 o'clock in the morning session, for the sake of defeating the Nebraska bill"

Gerrit Smith is expressing his commitment to the cause of defeating the Nebraska bill. He is stating that he would have gone to a 3 o'clock in the early morning session if it was required to do so in order to defeat the costs. He is highlighting his commitment to the cause and his determination to go to excellent lengths to ensure its success. He is also expressing his rely on his readers, that they will not misinterpret his words to suggest that he is not going to go to such lengths. He is revealing his faith in his readers that they will understand his commitment to the cause and his determination to do whatever it requires to guarantee its success.