On the morning after Minority Leader Nancy Pelosi, D-Calif., broke a record for the longest filibuster in the history of the House of Representatives - an eight-hour defense of immigrants - a Baltimore amateur genealogist named Jennifer Mendelsohn sat in her home office and logged onto Ancestry.com to begin her own form of protest. "Let's see," she said, typing in the name of a Republican congressman whose anti-immigrant comments had been controversial.