Currently, leftists have reportedly generated $1 million in donations for Rep. Joe Wilson's opponent last time, Rob Miller. Wilson, for his part has reaped about $750k. But there is a big difference beneath the surface: : Kos and DCCC immediately organized fundraising against Wilson. Wilson's $ is based on his own appeal and spontaneous contributors.  From Paul Kane of the WaPo: 

With a political arms race in full force, Rep. Joe Wilson (R-S.C.) has raised almost $750,000 in less than 48 hours since his shout of "You lie!" to President Obama during the Wednesday address to Congress, almost matching the Internet-fueled haul of his likely Democratic opponent.

A senior GOP official said Wilson, who apologized to White House Chief of Staff Rahm Emanuel after the health-care speech but has since refused a more public apology, has turned his own previous sleepy campaign machine into an Web-friendly effort. Just as liberals have poured cash into the campaign of Rob Miller, who lost to Wilson by almost eight percentage points in 2008, conservatives are pouring contributions into Wilson's campaign at an astonishing rate.

Miller, a former Iraq war veteran, has raised more than $1 million for his 2010 rematch with Wilson, according to the Democratic Congressional Campaign Committee.

Republicans expect Wilson to also top more than $1 million by Monday because of the immense publicity he's received in the last 48 hours. In the relatively inexpensive South Carolina district, which takes in the southern portion of the state, the two opponents will likely have their two-year budgets filled in less than a week, strategists say.

To put this fund-raising haul in perspective, Wilson, by early next week, could equal the total amount of money he raised in the entire two-year-election cycle of 2008, when he raised a little more than $1.1 million.