I don't know a whole lot about politics or American history, but you don't have to in order to know there's always rivalries. I usually don't pay much attention to it. I have no interest in listening to politicians bicker and insult each other. But 10 Best Political Rivalries in American History did catch my attention.
In several cases, the individuals who were at odds with each other in the political arena had personal problems with each other first. Burr and Hamilton hated each other and it ended violently. Such was also the case with Brooks and Sumner.
The problems between VP Richard Nixon and Senator John F. Kennedy were also personal, but on a different level. Nixon's sense of insecurity and inferiority caused him problems in the political arena. Sure, he had all the credentials, but he came from a poor family whereas he viewed Kennedy as a privileged rich boy. He didn't think he measured up. Later as president, he had to work to expose the grime in possible opponent Senator Ted Kennedy's life in the 1972 election. His negative self image affected his political career, causing conflict that may not have been necessary.
What I mostly see in this article is that your personal life and career will always affect each other to some degree. Politicians who couldn't get along with one another personally couldn't work well together and even caused them to turn to violence. The way you grow up, view yourself and view others will affect your confidence in your work. If you don't think you can make yourself look good to the public, you have to try to make someone else look bad to give yourself chance.
As much as some people would like to make a clear distinction between work and personal life, you just can't. They'll always be at least somewhat connected. If you lack honesty and integrity at home or in your social life, chances are you may at work as well. If you have problems at work, you'll bring them home with you. They can never be entirely separated. And don't think you leave your problems behind when you walk out the door. They will follow you.