Edit to that:
They're both center-left, actually. Arias runs for the PLN, the traditional social-democratic party in Costa Rica. In the House elections (pr ... I think), they're polling 36%. Solis is running for a fairly new party and is running largely on a platform of opposition to CAFTA. His party is taking about 25%. The third placed candidate at about 8% is a Libertarian, by the way, while the traditional centre-right party's (to which the current president belongs) candidate is polling at under 4% - and the party is polling at no more than about twice that.
Ah, interesting, ag. Arias does seem to be winning, just by a tiny margin. (I *think* there's no runoff, might be wrong.)
There is a run-off, as far as I know.
Arias is, of course, not a rightist in the traditional Lat.Am. sense - he is a moderate liberal, and he wants to ratify CAFTA (something that should be a no-brainer for Costa-Ricans, especially given that all the others have, but somehow it has become controversial). Arias is also not anti-American. I guess, a lot of people in the Church don't like that.
Not ratifying CAFTA, given that the neighbors have, would be ruinous for Costa Rica; trying to renegotiate it would mean to do this from a hugely disadvantageous position (US does not really care if Costa Rica is in or not - this would be dumber than the NYC Transit Union's negotiating tactics).