What 100 years of voting looks like

From Salon.com:

The story of American politics over the last few generations is one of ever increasing partisan polarization. Barack Obama was able to pick off a few Republican states in 2008, but ideology and party identity have largely synced up, draining the electoral map of much of its fluidity. When it comes to presidential politics, there are a lot of red states, a lot of blue states, and only a few true swing states...

To fully appreciate the journey that produced today’s polarized electoral map and the trends that will shape the future, Salon’s art director, Benjamin Wheelock, pored over a century’s worth of presidential, congressional and gubernatorial election results from every state, assigning each a shade of blue or red for each election year. Watch as the map travels backward from the divide we know today...