I ask this because third party candidates are often blamed for stealing votes from another candidate who otherwise has a viable chance of winning.
An example of this could be seen in Is Gary Johnson Taking More Support From Clinton Or Trump?
The majority of pollsters (12) have Clinton’s margin over Trump shrinking when at least one third-party candidate is included. The difference in margins, however, varies among pollsters, and a few, such as Ipsos, have Clinton’s lead rising by the tiniest of bits when at least Johnson is included.
I would argue that non-democrat and non-republican parties should focus on winning seats/district before running for president. Is there a problem with this argument?