An aging sign at City Hall in Stockton, Calif. A judge has ruled that the city is eligible for federal bankruptcy protection. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

Sen. Marco Rubio, R-Fla., says talk of a bipartisan agreement among eight key senators working on immigration law is "premature." Susan Walsh/AP hide caption

itoggle caption Susan Walsh/AP

Opposition research is becoming a given in politics, sometimes even at the local level. iStockphoto.com hide caption

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The home of Kaufman County District Attorney Mike McLelland is surrounded by police tape in Forney, Texas, on Monday. Authorities launched a massive investigation into the weekend killings of McLelland and his wife. Tim Sharp/Reuters /Landov hide caption

itoggle caption Tim Sharp/Reuters /Landov