Time's Halperin and Carney:

Clinton believes Obama's support is largely a mirage--a bunch of true believers whose passion might help him cinch the nomination, but that may prove an insufficient bedrock for winning a general election when the spell might be broken by tough questions about national-security credentials, economic-policy plans and rich experience. She can't stop from shaking her head in disbelief when longtime friends who are elected officials inform her that they are going to endorse Obama and were chiefly convinced by their children's enthusiasm for his candidacy.

--Michael Crowley