For the past few months, a single lawmaker has prevented Democrats from carrying out their agenda in Congress. For now, there is no simple solution in sight. Annie Karni, a congressional correspondent for The Times, explains the issue surrounding Senator Dianne Feinstein.Guest: Annie Karni, a congressional correspondent for The New York Times.Background reading: 

• Ms. Feinstein, who has been absent from the Senate for more than a month after being diagnosed with shingles, sought a temporary replacement on the powerful Judiciary Committee.
• High-profile absences have created complications for Democrats in Congress and prompted new questions about the future of the Republican leadership.

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