The second round of questioning is likely to be more aggressive and pointed. Some potential lines of attack — civil rights, commerce clause — were previewed yesterday, but there will be others. Don’t be surprised if today’s hearings run late. Senate Democrats will almost certainly insist on a third round of questioning, if not more. They’ll make more complaints about the failure to release the SG memos, and argue this justifies more questioning. As a result, Roberts may face more questions tomorrow, and the outside witnesses could get pushed to Friday.