The number one word on Obama's blog is, of course, Obama, followed by campaign, senator, change, hope, donate, etc.
The number one word on McCain's blog... is also Obama. And the one word I couldn't find in either word cloud? McCain.
Go try it on your favourite blog - it's fun! I ran Garth Turner's and came up with this:
I couldn't find any Conservative candidate blogs to compare it to, but I did run Stephen Taylor's and... oh, THERE'S McCain!