The election site aggregates lots of data and content together, and draws heavily on Google news to produce pages specific to candidates and issues.
What I like more though are the trends and visualisations - you can see both voting behaviour - the first Republican primary below...
... and current levels of interest in the candidates in terms of searches, Google News mentions, and YouTube video views.
There's also an 'on the ground' section where you can see news overlaid on a map.
It's a brilliant resource... Now I'mm waiting to see what Twitter can come up with.