SAVANNAH — Regardless of whether he wins his race for Congress this fall, Augusta businessman and Republican Rick W. Allen is on the brink of joining an exclusive club in Georgia politics — candidates willing to spend $1 million of their own money seeking election. The owner of a construction company that builds schools, hospitals and office buildings, Allen is challenging Democratic U.S. Rep. John Barrow in one of the nation's most competitive congressional races of 2014. After five terms in office, Barrow is an intimidating fundraiser who has already hauled in $2.3 million for his re-election campaign.