CLEVELAND, Ohio -- Rep. Jim Renacci and an affiliated group raised more than $2 million during the most recent fundraising quarter in his bid for the U.S. Senate, Renacci's campaign announced Monday.

Renacci's campaign did not immediately offer a breakdown of how much of the $2 million was raised by his campaign committee, versus how much was raised by the affiliate, which faces greater restrictions on how the money can be spent. It also did not share how much money Renacci has on hand, a key political fundraising metric.

However, the campaign did specify that the $2 million haul did not include any contributions from Renacci himself. For the last fundraising period, Renacci, who became wealthy in business before entering politics, contributed $4 million of the $4.5 million he reported raising.

Renacci, a Republican, is challenging Democratic Sen. Sherrod Brown in the November election. Both candidates will have to disclose detailed second-quarter campaign finance activity before a federal deadline next Sunday. Brown's campaign plans to release preliminary information about its own fundraising activity soon, a spokesman said.

Brown so far has dramatically out-raised and outspent Renacci, who is running statewide for the first time. Medium Buying, a Republican-affiliated political media firm, said last week that Brown already had spent $3.1 million on TV ads, compared to $481,000 from Renacci.

Renacci so far has yet to receive significant support from outside political groups, which generally play a major role in Ohio Senate races. The Republican Leadership Fund, a Super PAC affiliated with Senate Majority Leader Mitch McConnell, has announced reserving $40 million in TV ads for Senate races in six states -- Indiana, Missouri, Nevada, North Dakota, Tennessee and West Virginia -- but none in Ohio.

Besides the practical necessity of money in a political campaign, Renacci also needs to strengthen his fundraising totals to improve the national perception of his prospects of winning. On Monday, Nathan Gonzalez, a nationally respected political analyst for Roll Call, switched his outlook for Ohio's Senate race as "leans Democratic" to "likely Democratic."