Pro-Donald Trump election deniers have been quietly embedded in nearly half of voting certification boards in battleground states’ largest counties, according to a new analysis. Reuters on Tuesday revealed its investigation of 35 county election boards — sampling the five largest in seven swing states — found 16 had at least one member who expressed pro-Trump skepticism about voting machines, mail-in ballots and the 2020 election result. The skeptics include a Michigan Republican who called on Trump to challenge his 2020 defeat, a North Carolina board member who emailed legislators false voter…