Yes, we can.

[Ghoulish Delight]

There are some numbers trickling in on early voting in states that allow such data to be collected.

In some key states, Obama is showing very large leads among early voters :

.-----------Poll --- % Voted ---------------------- Non-Early
State ---- Date ---- Early ----- Early Voters ------ Likely Voters
================================================== ==
NM ----- 10/13 ---- 10% ----- Obama +23% ----- Obama +6%
OH ------ 10/13 ---- 12% ----- Obama +18% ----- Obama +4%
GA ------ 10/12 ---- 18% ----- Obama +6% ------ McCain +11%
IA ------- 10/9 ----- 14% ----- Obama +34% ----- Obama +10%
NC -------10/6 ----- 5% ------ Obama +34% ----- McCain +5%


Not that one would expect that huge difference between general polling of likely voters and these early voters to hold up come November. But it does seem to be an early indication that Obama is winning the voter turnout game among his base.

And, as a comparison point, Bush had more than 60% of the early vote over both Gore and Kerry, so this appears to be a switch in early voter pattern, from a party perspective.