Yahoo put out a blog post outlining the various things it is doing with its search results for election-related queries.
If you search "2012 Presidential Polls," Yahoo will show you the latest national poll numbers at any given time:
If you search for "swing state polls" specifically, you can see how the swing states are trending at that moment. You can also search for state senate races and see related polls (for example: "Kentucky Senate Race 2012").
"You’ll also be able to get details on key propositions, issues, and referenda using the Propositions Direct Display," Yahoo explains. "Search for the state proposition number." For example, you could search for "Colorado Amendment 64". and see information about that.
Users can also get results for all of the races as they come in, by searching for your state's specific races. "For instance, you can search for your state’s local U.S. House of Representatives results by searching for [New York U.S. House Results] and get results in real-time," says Yahoo.
Currently, the Yahoo homepage is showing "The Obama Message," "The Romney Message," the "Election Control Room," a Flickr Election 2012 photo gallery, and a link to polls with closing times.