The latest Pew Research Center national poll released today underscores how slender a beachhead President Obama has established among whites more than two years into his presidency. In his 2008 election, Obama ran well only among two groups of whites -- young people and white women with at least a four year college education, two groups that are generally receptive to government activism. In the 2010 GOP landslide, those groups stuck with Democrats relatively more loyally than the rest of the white electorate, but the party's support tumbled even among them. Figures provided to National Journal by Pew from the...