I chose not to vote in the Bush / Gore election. Say I did choose to vote in the election, and vote for your preferred candidate.
In my state, the election that was decided by a vote of 2,589,026 to 2,019,421 as an Al Gore victory, would have, with my vote added in, Gore wins 2,589,027 to 2,019,421.
If I had voted for Bush, the tallies would have been Gore 2,589,026 Bush 2,019,422.
Where exactly did I put democracy at risk? The outcome of the election would have been exactly the same regardless if I did not vote, if I voted for Bush, if I voted for Gore, if I had voted for Nader, Buchanan, Browne, Hagelin, Phillips, or a write-in candidate.