Looking at the Libertarian platform he will only take away votes from the Republican candidate.
In a close election could make a big difference.
2000 Election Florida vote
Bush 2,912,790
Gore 2,912,253 537 vote difference
Nader 97,488
Electoral vote Bush 25
Gore 0
https://en.wikipedia.org/wiki/United_States_presidential_election_in_Florida,_2000