Time's Swampland blog features Today on the Trail (frustratingly, there's no permanent link to the most recent rundown), and RCP maintains a scattershot calendar with hyperlinks to a relevant news article.

But the best source, by leaps and bounds, for where each presidential candidate is on any given day comes from Washingtonpost.com. Sort by candidate, date or state, and keep current with an RSS feed. Very impressive!

Cross-posted at No Straw Men.