Poll: 57% Majority Say National Third Party a "Good Idea," 4% Note that They "Already Exist"

A new poll from Fox News:

A 57-percent majority thinks it would be a good idea if a third national political party were formed to run against the Democrats and Republicans. Thirty percent think a third party is a bad idea. Two out of three independents (67 percent) think a third party is a good idea, while half of Republicans (50 percent) and over half of Democrats (58 percent) agree.

Taking a closer look at the poll itself (pdf), 10% responded that they "don't know" whether this would be a good idea, while 4% answered that national third parties "already exist" (p. 3 of the poll).