Answer:
The writer is implying that politicians are shameless people who would do anything for their own gain.
Step-by-step explanation:
Charles Farrar Browne was an American humorist writer and a comedian who is more better known by his pen name Artemus Ward. His book "Interview With Lincoln" is a satirical or humorous representation of the real world as he sees it.
The passage from the question is from the text where he seems to suggest that the "owner" of the place was a generous place. But with politicians, there can be no honor or full trust. The use of the word "hog-pen" suggests that he is ready to accommodate anyone who's willing to be on his side. After his whole place had been filled, he still wants people to be with him even though there seems to be no space left. Thus, these lines seems to imply that the politicians will do anything if it's going to give them some profit out of the situation. It shows their shamelessness.