The Hill has this article about efforts by opponents of the No Labels presidential candidate idea to brief Democratic members of Congress about why they are so opposed to the plan. The opponents include the groups Move On and Third Way. Thanks to Thomas Jones for the link.
There are attempts being made to persuade the public that the No Labels’ presidential plan is illegitimate. For example, see this article at Real Clear Politics, written by Frank Donatelli and Leslie C. Francis. It is titled “The Threat To Our Two-Party Democracy.”
The authors are misusing the definition of “two-party system.” That phrase was coined in 1911 to describe the British party system. It means a system in which two parties are much larger than all the other parties. It doesn’t mean a system that only has two parties.