What RBG said. Caladiums have a natural dormancy period even here in Ecuador where they're native, and where we really don't have a "winter" - they'll drop their leaves and snooze through the dry season.
So, as long as you keep the pot in a cool, dark, dry place and don't water it, you'll be fine.
Edit - and if you do this, you've got a chance at seeing Caladium flowers in the spring when you wake them up. If you've got a nice, well-established set of tubers growing and you allow them 6 months of dormancy it's quite likely that they'll feel good enough to bloom for you. This is pretty special - Caladium flowers are quite fragrant and unusual.