So, I was wondering whether Sec. Clinton faced the same sort of pressure from the Obama Campaign in 2008 that her campaign is trying to put on the Sanders Campaign now. I found this article which is, to say the least, an eye opener. To summarize, rather than the Obama Campaign putting pressure on Clinton, Clinton was putting pressure on Obama to drop out. Eventually, especially after Obama had secured the required number of delegates, there were calls to drop out. Only after the California primary did she drop out. So, the calls for Sanders to drop out are completely hypocritical. Lest some think that the lack of links to the contemporary articles from 2008 are missing for reasons other than those stated, I am supplying as many as I can find.
So: Clinton in the Wilderness:http://www.washingtonpost.com/wp-dyn/content/article/2008/04/21/AR2008042102553.html
The Card Clinton is Playing:http://www.washingtonpost.com/wp-dyn/content/article/2008/05/08/AR2008050802807.html
Hillary Clinton Raises the Specter of the Unspeakable,http://www.washingtonpost.com/wp-dyn/content/article/2008/05/23/AR2008052302789.html