Even when the opposition vets their opponents and finds something out, how are they going to get that information out there? The media, and when the media is in the pocket of one particular candidate that information will not be released, and people can only find it online..unfortunately most people still watch the Nightly News and get the left wing slant, so anything that makes the left look bad or a particular left wing candidate look bad, that info is as good as gone
It's called "ad time". Why do you think they are non-stop fundraising?
You hold a press conference.
Plus the opposing candidates discuss the damaging findings on the campaign trail in their stump speeches and at their debates.
Finally, the other parties’ nominees directly confront the scandal-ridden candidate in the three nationally televised presidential debates with tens of millions of Americans watching.
Remember Bill Clinton and Monica Lewinsky?