Gail Collins: Presidentially, two parties are enough

Things we would currently be better off without:• People who ride bikes on the sidewalk• Robocalls• Third partiesI know, I raised the bar a little at the end. Just trying to sneak us into a discussion of a critical part of our presidential elections that almost no one can stand to talk about.There’ll be quite a few third-party candidates floating around on our ballots this year. Some are doing fine things on the state and local levels, but avoid the ones who want to run the