Jesse Jackson Jr. resigns, 2 weeks after winning reelection with 63% of the vote.

The NYT puts it this way:

Voters, it seemed, did not care [about his mental and legal problems], particularly given the strong Democratic-leanings of his district and a group of little-known opponents who challenged him....

How can you tell they didn't care? He was the Democratic Party candidate. You'd have to have a high level of objection to switch parties. You could very easily care yet still vote for your party's candidate. You vote for the party and trust them to get it straightened out, which seems to be what is happening, since he has resigned.