Martin O'Malley (D-inc): 47
Bob Ehrlich (R): 47
(MoE: ±4%)
Sorry to sound indecisive in the title, but the first Washington Post poll of this year's Maryland governor's race reaches two different conclusions, depending on whether you want to look at likely voters or registered voters. The LV model shows a tie between Democratic incumbent Martin O'Malley and Republican ex-Gov. Bob Ehrlich in their rematch, a closer result than any other pollster (including Rasmussen) has seen.
If you prefer a registered voter model, though, O'Malley has a decently comfortable lead of 8 points, at 49-41, which is pretty consistent with most previous polls of this race. We've seen this before in a few polls of other races this year that have offered the choose-your-own-adventure approach (like Franklin & Marshall's PA-Sen polls), showing just how big the disparity is between in voter motivation between the two parties right now. November's storyline is going to be shaped by how well Democrats do at getting currently "unlikely" voters to turn out.