I believe I found a situation in which, by honestly voting Nader 5, you can cause both Nader & Gore to lose, but by voting Gore5 Nader1, you can cause Gore to win.
Here is the model:
4 B=5 G=0 N=1
3 B=5 G=1 N=0
1 B=2 G=5 N=0
x B=0 G=4 N=5
7-x B=0 G=5 N=4
Where x represents how many are bold enough to score a third party highest. I think somewhere in the 2-5 range, Bush wins by defeating Nader in the runoff (due to that one center-left voter). However the model I posted requires x=7 for this, so something must be off.
Can someone do me a favor and check my math on this? If my conclusion is valid, then it seems that if STAR did get implemented, we would need to see an explosion in third parties and independents on the ballot in order to avoid 2PD.