These wonderful visualizations are from an election maps results site (LINK) via Brad Feld (LINK). I wanted to see 2004 and 2008 on the same page.
This is a map of the US according to which states went Republican or Democratic in the 2004 election but with the map scaled by population, not land area.
And here is the same map for the 2008 election again with the map scaled by population, not land area.
That's a close of a "landslide" as you get these days.