Rep. Alan Grayson, D-Fla., whose antics inspired the website MyCongressmanIsNuts.com, has been sued by his campaign advertising firm for failing to pay them a $20,000 win bonus. They are also suing him for an additional $50,000 for breach of contract, Politico reports.

Grayson, whom a Republican operative once described to me as “the gift that keeps on giving,” is near the top of everyone’s endangered list for the 2010 elections. This will add one more issue to the race.