The field for Indiana's primary election for a U.S. Senate nomination is a little less crowded.

Hamilton County businessman Terry Henderson has suspended his campaign, the Indianapolis Business Journal reported Saturday. Henderson was among six Republican candidates seeking the GOP nomination next spring to oppose Democratic Sen. Joe Donnelly in the 2018 general election.

Henderson told IBJ that he was leaving the race because "it was going to be enormously expensive in order to get the necessary name recognition." He also said, "The only real way to come up with those kinds of funds is to personal-finance."

Henderson raised just $5,400 in campaign contributions through September while lending his campaign $250,000 of his own money, according to a report filed with the Federal Election Commission. He reported having $100,000 in cash on hand on Sept. 30, compared with $4.6 million for Donnelly, $2.4 million apiece for Republican U.S. Reps. Luke Messer and Todd Rokita, and $1 million for former Republican state representative Mike Braun.

Others seeking the Republican Senate nomination are Kokomo attorney Mark Hurt and New Albany college administrator Andrew Takami. Lake County resident Martin Del Rio announced recently plans to run against Donnelly in the Democratic primary election.