[tinkthank]

We, meaning US citizens about whom this poll is and the group a member of which I proudly be.

2, meaning those two only who receive official national funding (1$ per tax return, remember), and meaning those two with more than even slightly nominal membership in a house of representation.
I don't know what you mean by "nationally recognized". If you mean not "officially laughed at during dinner parties in Washington" or "will not cause you to get beat up when wearing their party slogans on T-shirt in 80% of all US towns with population under 80.000", then the number may be 3 in toto. Any party can run on a ballot, even (gasp!) in the US (but perhaps we'll change that soon). In other countries whose national ballots I inspect regulary have, usually, anywhere between 20 and 40 parties represented on a ballot, of which 6-8 have more than nominal representation (not representing some splitter group with less than 0.2% representation, like the "Silly Party" or "Gray Haired Panthers" etc. (both of which, incidentally, you can see on all Berlin (Germany) ballots) for the Last 10 years)).