Stuart Rothenberg and Nathan Gonzales on Political Wire provide a guide to the "Races to Watch" on US election night on Tuesday. Bear in mind that we are five hours ahead, so the fun starts at midnight (our time) by watching for three results in Kentucky, which should show the shape of things to come for the House of Representatives.
No doubt, BBC News 24 and Sky News will be covering the elections throughout the night.
If you can't get CNN through the cable or satelitte, I would recommend CNN Pipeline which allows you to sign up for 24 hours for just 99 cents. It gives you a dashboard which allows you to watch any one of four live feeds plus their whole current news video collection. It is well worth subscribing in the run-up to the elections and for election night.