Question

Should the same impeachment process and standards be used for judges, justices, and presidents?

Are the same process and standards used?

Answer 1

Yes and yes. Read this article.

http://en.wikipedia.org/wiki/Impeachment_in_the_United_States

Answer 2

President Clinton was not convicted by the Senate for perjury (i.e., lying under oath). The Senate found his actions did not constitute a high crime and misdemeanor.

If a federal judge acted similarly (i.e., lied on the stand in regard to an extramarital affair), would the federal judge be more or less likely to be impeached?

Answer 3

I assume sitting Federal Judges would not be so stupid to directly lie under oath, since extramarital affairs are state offenses, and in most states, that is illegal, the judge could plead the 5th if he could be charged by that state (of residence, or visiting) http://www.freep.com/story/life/2014/04/17/graphic-states-with-antiadultery-laws-include-michigan/77154744/
Now if he couldn't plead the fifth, most would tell the truth, and suffer the wrath of the spouse, rather than be convicted of perjury. My guess, is some unpopular judges would go to trial, and some would even be convicted.