Final answer:
All federal judges, not just Supreme Court justices, are appointed for life, which ensures their independence and freedom from political influence.
Step-by-step explanation:
All federal judges, not just Supreme Court judges (justices), are appointed for life. This means that once they are confirmed by the Senate, they hold their positions until they retire, resign, or are impeached. This lifetime appointment ensures that federal judges can be independent and free from political influence. For example, they can make decisions based on the Constitution and the law, rather than being swayed by the desires of the President or Congress.