Chattanooga attorney John Wolfe on Friday afternoon filed suit against the Democratic Party of Arkansas, which had ruled that he would not be awarded any delegates to the national convention despite his strong showing in the election.
He asked in the lawsuit that he be awarded delegates in line with the 67,604 votes he received.
Attorney Wolfe said he traveled from East Ridge to Little Rock late on Leap Year Day and into the wee hours of March 1 to file qualifying papers.
He said he filed every form that was presented him and he paid a $2,500 filing fee.
The party has claimed he missed two later deadlines.
Attorney Wolfe has been running an anti-Obama campaign in several states.
He was the only other Democrat on the Arkansas ballot.
Meanwhile, he was headed to Texas, where he is on the ballot for next Tuesday's voting.
He said there are two other Obama challengers, "but they have basically de-activated their campaigns. One of them is endorsing me."