He was a Senator and John Kerry's running mate
He was also indicted by Obama's AG Eric Holder for campaign finance violations on six felony charges of violating multiple federal campaign contribution laws to cover up an extramarital affair. He eventually went to trial and was found not guilty on one count and a judge declared a mistrial on the other 5 counts
I don't recall Dems (or Republicans) at the time making any fuss about this.
That's how the world used to work.
Anyone remember Gary Hart. He got caught spending time with a woman wasn't his wife (Donna Rice) both of whom denied any affair and his presidential campaign was over a week later
Weird how times have changed...