From Nik on the Numbers:
Results of today’s CPAC-Nanos tracking poll show the Conservatives are still holding strong nationally at 38%, followed by the Liberals at 31%, the NDP at 17%, and the Green Party and the Bloc Québecois tied at 7%. On the CPAC-exclusive leadership index scorecard evaluating trust, competence and national vision, Stephen Harper leads with 108 points, followed by Jack Layton at 51 points, Stéphane Dion who has dropped to 32 points, Elizabeth May at 14 points and Gilles Duceppe at 13. Stephane Dion’s one day drop (from 48 to 32 points) coincided with Bob Rae’s intervention in the campaign yesterday attacking the Conservatives and the NDP. Even factoring the personal Dion drop, there was no impact on support for the Liberals.
You can see the details here.