This is an "art" piece that turned up at Tonkin Park in Downtown Renton today. The reasonable assumption is that the artist is eluding to the race between the Democrats and Republicans on any level.
The message could have many meanings. Perhaps the Republican have something to fear this year? Perhaps the Democrats have become a massive juggernaut due to the excitement caused by many campaigns, especially at the federal level, or simply Obama has become so much larger than life when compared to McCain.
Whatever its intended meaning may be, it certainly makes a point.