It looks like the bad sample on 4/12 for Rasmussen has rolled off. Bush now holds a 46-44 edge.
Rasmussen is also reporting numbers that suggest a decrease in pessimism about the economy and war on terror. That should bode well for the Bush campaign.
45.5 to 44.1
Bush gets the "round up" today on the website 
And today it looks like he's rounded back the other way: Bush leads 45-44.
The Rasmussen numbers seem to be a little more stable the last few days. Of course, just as one should expect unusual fluctuations in the statistics, there can be a run of results that agree.
