The depth and breadth of Hillary Clinton's support among Democrats is daunting for other potential Democratic candidates in 2008, especially coupled with her enormous fundraising edge.

This is the ultimate mommy party issue, if you believe that Democrats are the mommy party and Republicans are the daddy party.

McCain needs Hillary to run because that's what keeps the Republican coalition together. She helps unite the Republican base.

Lack of depth, especially in the frontcourt

He's an Internet stock right now. A lot of potential, but we're not sure whether there's a good business model there or not.

There's a signaling going on with this spending. Democrats who are on the margin might feel more free to support Judge Roberts this time, particularly if they feel they might oppose the next nominee.