From your link, check out what TakeBackCongress.org has to say about the impact the Libertarian Party canidates may have in the Colorado and South Dakota races respectively.
"Rated a dead-heat, Strickland went nasty negative early. Allard's response ad was strong and the voters are blaming both candidates for the dust-up. This is helping Strickland and a loopy libertarian candidate, Rick Stanley. If Stanley meets his polling numbers at 6% in the vote, he could throw the entire Senate to the left-wing.
"This is a big one. Johnson is very vulnerable and this would be a Republican takeaway. If he loses, it would send a message to Johnson's fellow South Dakota Senator--Tom Daschle--to stop playing games with the American people and our security. The real x factor in this race is the Libertarians. Here is another race where the Libertarian party may well throw the US Senate to the Democrats."
No wonder the LP is infested with Democrat style propaganda.
So in the real world, I get annoyed when I see a splinter party of well meaning people who are mostly conservatives stepping up to throw the entire Senate to a group we all agree are really bad guys--the Dems. If there were some real world payoff, I might understand.