Because it's going to take 2157 delegates to the Democratic National Convention in August 2008 to secure the nomination and you have 138 days, from the opening of the Iowa caucuses to the closing of the polls in the California primary, to do it. You're going to have to juggle campaigns in two to three dozen states (most of them concurrent), recruiting and training thousands of volunteers and field staff. In each targeted state, you'll need to contact tens, perhaps hundreds of thousands of Democratic and Democratic-leaning voters and caucus participants, and identify those who are leaning your way and those who need a little persuasion. Then, well, you need to persuade the persuadable. Then you need to make sure you get all these identified voters and caucus participants to their polling/caucus venues on caucus and primary days. If they can't get there, they'll need rides to the polls, or maybe absentee ballots.

(Note: I'm crossposting this here from dKos, as it got quickly buried yesterday.  

My spouse, Eric Brunner-Williams, became involved in the November Victory group as a senior advisor on Chris Miller's campaign in the Maine gubernatorial primary. He remained on the list after Miller's loss in June, and has been offering his input since.  Last week, the group's director asked him to write this fundraising request regarding the upcoming August 18th conference, where Paul Hackett will be the keynote speaker. I'll be running a workshop on "GOTV on a Shoe-string", underwritten by DraftGore2008PAC. Hope to see many in the netroots there.)

The DCCC and the DSCC have targeted a few House and Senate races, and provide no financial assistance to campaigns other than those it has selected. The strategic goal of each is to obtain a majority in the House and Senate, respectively. When that goal is met, Richard Pombo will no longer chair the House Committee on Resources, James Inhofe will no longer chair the Senate Committee on the Environment and Public Works, and Dennis Hastert and Bill Frist will no longer make the rules for the the House and Senate, respectively.