Greg Sargent - Washington Post: Four national polls shows Obama and Romney tied on the economy — perhaps suggesting a potentially signfiicant shift in the race’s dynamics:

• The new Fox News poll shows Obama and Romney exactly tied at 46-46 on who would better improve the economy and create jobs.
• This week’s CNN poll finds Obama and Romney in a statistical tie, 50-49, on who would better handle the economy.
• This week’s Post poll finds Obama and Romney in a statistical tie, 47-45, on the same question.
• A Rasmussen poll on Tuesday found Obama and Romney at 47-45 on who is more trusted on job creation.