I have no doubt that the median income is pretty flat -- the modern economy gives great returns to education and risk. There's a reason they didn't use the mean for this press release; the long tail out to the right would raise the needle in the middle. This long tail extension will continue happening under a Democratic president too. Raising the minimum wage won't do much for someone earning around the median of $30,000 per year (approx $15/hour or three times the minimum wage), and these people tend not to get too much in the way of transfer payments under Dems or Republicans (they earn too much).
Figure for 2005: $46,326
Figure for 2003: $43,318