Read the full NBC News/Wall Street Journal poll

All through December, Rudy Giuliani has been slipping in both national and state polls … including his own state of New York, but few of those polls have been as stark as the new NBC News/Wall Street Journal survey.

Giuliani had been the clear leader all year in this poll, but the latest numbers now show him tied at 20 percent with Mitt Romney among Republican primary voters. They are followed by Mike Huckabee at 17 percent; John McCain at 14 percent; and Fred Thompson at 11 percent. For Giuliani, it’s a decline of 13 points since last month.

As for the Democrats, Hillary Clinton has maintained her lead with forty-five percent of Democratic primary voters saying they would vote for her, compared with 23 percent for Barack Obama and 13 percent for Edwards. No other Democratic candidate receives more than 4 percent.