Not just members of congress. It’s their spouses, their kids, their sibligs. How many people can swear on a bible that ALL their first degree relatives and those of their spouse are 100% clean?
Would you be willing to let one of them go to jail for life for something you could get them out of with a vote?
"Dang right I destroyed my brother's Presidential hopes because of my prior legal convictions and drunken behavior, Lol.
Heck, he even pardoned my cocaine conviction on the way out from his SECOND term."
The sins of your offspring and siblings can be cured, unless the actual candidate is covering up something. If a cove-up needs to occur to win/appointed, that person should exercise humility and not seek public positions.