Freshman Democratic Rep. Alan Grayson announced today that Vice President Joseph R. Biden Jr. would headline a luncheon for him later this month, a clear sign that Democrats are preparing for a tough fight in Florida’s 8th District.

The Aug. 19 luncheon for Grayson features Biden, Sen. Bill Nelson, Orlando Mayor Buddy Dyer and other local figures.

Grayson instantly became a top election target when he defeated Republican incumbent Ric Keller in 2008 in the competitive Orlando-area district.