Damien Mulley mentions a site called the Ireland Caucus where Irish people can vote for the next US President. While I think it's an interesting idea, it's a shame he didn't mention that there will be an actual primary (for the first time it won't be a caucus) on February 5th through the 12th for US citizens in Ireland. There's a long explanation how to vote here, but the summary is this:
Our primary will be held from the 5th to the 12th of February. The polling station will be set up at O'Neill's Pub on Suffolk Street from about 10am until late. Other than that though if people cannot make it in person, internet and fax voting will be available. Anybody who votes will have to be a member of Democrats Abroad Ireland by January 31st just so we can verify them.Make sure you register at Democrats Abroad by the 31st and make sure to vote! Remember to register for the general election in November here - this will also allow you to vote in state's Senate and Congressional primaries later this year.