Tom Formicola, who lost a bid for a Congressional seat in 2006, decided not to run against Pryor after thinking about it further over the weekend and discussing it with his family. Republican Party Chairman Dennis Milligan says the party does not plan to have a candidate for the U.S. Senate seat.

Filing for elective offices in Arkansas ends Monday. None of Arkansas' Congressional delegates have drawn opponents.

Pryor won in 2002 by beating Republican incumbent Tim Hutchinson. Just in case he had a re-election fight, he has raised more than $4 million for a campaign. The sum rivals the $4.22 million that he raised for his campaign in 2002.