I am on the road in Toronto, so not a lot of blogging, but let me point to an idea that should spread. The Toronto Globe and Mail has a regular feature called Reality Check, where they take claims by politicians and officials, especially ones in negative ads, and research them.
Of course, it's easy to politicise such a task, finding flaws only in the party you don't like, but with proper checks and balances to produce objective journalism, I think every newspaper should have this, and featured prominently. Yes, we see it in blogs and mailing lists, but usually with bias. We need it in newspapers.