Last week, President Obama's job approval rating sank to 46 percent in a Gallup poll, matching the lowest weekly job approval rating of his presidency. Few Americans were surprised. Obama's bumbling response to the BP oil spill drove the latest decline in his popularity almost equally among Democrats, Republicans and independents. But another Gallup poll taken about the same time contained even worse news for the president. After a year and a half of "hope and change," 49 percent of Americans consider the Democratic Party "too liberal" -- compared with 39 percent in 2008, when Obama was elected. This is...