Cut-and-pasted from the live blog:

10:56 A.M.: Kagan won’t answer whether she personally believes aspects of the Citizens United decision, especially whether restrictions on free speech based on the identity of one party (corporations, and unions) are often designed to restrict the content of that speech.
Kagan says campaign finance laws were “selfless” act of Congress, because all empirical evidence suggests union and corporate money protects incumbents.
“Tell that to Blanche Lincoln,” Hatch says. “Lincoln is one of the nicest people around here who had ten million spent against her by the unions, just because they disagreed with her.”