After seven years, the Independent Party of Oregon is about to hit its 100,000th registered affiliate, and it began its primary election two days ago.
The IPO is the first political party in the United States to conduct Internet-based elections and the first political party in Oregon in more than 100 years to conduct its own primary elections.
If you don't want to vote by email, you can hand deliver your ballot or snail-mail it in. Lots of options for registered affiliates.
It's worth noting that although the Left routinely derides the "right wing GOP Teabaggers", 43% of TEA party associates identify as IPO or NAV, and 7% identify as Democratics. So while there's a small majority of GOP types, the Independents exert a lot of clout.