Outsourced to Media Matters:
Media Matters - ABC News/ Wash. Post withheld results of poll favorable to Obama: Summary: ABC News and The Washington Post issued staggered releases of the results of their latest poll, withholding from their first release results favorable to Sen. Barack Obama, including the finding that 50 percent of registered voters would vote for Obama for president versus 42 percent for Sen. John McCain. The next day, the Post ran an article headlined "Poll Finds Voters Split on Candidates' Iraq-Pullout Positions," which did not mention Obama's 8-point lead over McCain. Later that day, ABC News and the Post issued a second release with additional poll results that stated: "Obama continues to hold most of the advantages in the presidential race."
Why oh why can't we have a better press corps?