It’s kinda like the Google News “Elections” section, but with different filtering options on news content and added data related to this year’s campaigns. The new elections hub has predefined filters for the major U.S. presidential candidates (President Obama along with seven Republicans), as well as some of the primary issues being discussed (healthcare, government spending, etc.)
Google News offers similar filtering options for candidates, like this breakout of Mitt Romney news.
Where the hub gets unique is in its data and localization. With the Iowa Caucuses just a day away, the On the Ground section maps news and video content from around the state.
There’s also a Trends page that lets users compare search data, Google News mentions and YouTube video views for each of the eight candidates.
Postscript: Google has also created a Google+ page related to its politics/elections hub.