The House of Representatives Swingometer measures the effects of a swing in the two-party vote from the 2008 House elections
The Swingometers use Javascript and SVG, and are only tested so far in Firefox, Safari, Safari Mobile, and Google Chrome. Android 2.x and earlier users may need Firefox. Older versions of MS Internet Explorer probably can’t handle them. Opera might. Blackberry users are sent my condolences. Please feel free to hit the Contact form with bug or success reports.
Here is an article explaining the Swingometers from the perspective of analyzing the 2010 elections.
House of Representatives Swingometer
Electoral College Swingometer