Here's something I didn't come across in all of my research: during the Jackson Administration James Maher, the Superintendent of Capitol Grounds, directed the planting of two patches of "barbecue trees" on the east lawn of the capital. Their purpose? To provide shady groves in which to hold barbecues, one grove for Whigs and one for Democrats.
Joe Haynes, who writes the Obsessive Compulsive Barbecue blog, dug up the story, and his full write up has just been published in Smoke Signals Magazine. It's a splendid illustration of how entrenched a part of 19th century politics barbecue was.