The article states we must take every effort to preserve the integrity of the election which would mean it would go against everything the dems want:
1. Voter ID require
2. No vote by mail (note that Absentee voting is great) vote by mail is not
There you go - it would seem that Dan Coats would be in favor of both of these things. and in favor of avoiding statements like HRC telling Biden not to concede on election, or Bloombergs surrogates telling saying that the election wont be decided on election night - they are deliberately trying to sew discontent and paint the scenario where the only acceptable outcome is if biden wins.
The threat to the democracy is a political party that has spent the past three and a half years not accepting the outcome of the 2016 election.