COLUMBUS, Ohio (WCMH) — Sen. Sherrod Brown (D-Ohio) is expected to cruise unchallenged through the primary season as three main Republican challengers compete for the right to face him in November, and he’s using the time to build up his cash reserves.

Candidates in the race were required to submit campaign finance reports to the Federal Election Commission by Jan. 31. That included the four who had the most money in their campaigns: Brown, state Sen. Matt Dolan, Ohio Secretary of State Frank LaRose, and businessman Bernie Moreno.

The three Republicans will meet in the primary on Tuesday, March 19.

The filings show total contributions, total disbursements, loans received, cash-on-hand and more for each campaign for varying periods of 2023 based around when each declared his candidacy. Brown holds a strong lead over his GOP rivals in many metrics, including contributions, disbursements and cash on hand.

In terms of total contributions, Brown substantially outraised his three GOP counterparts. Brown reported over $17.3 million in total contributions, with just over $16 million coming from individual contributions. Moreno came in second, with over $4.2 million in total contributions. Dolan raised just over $2 million, and LaRose was just short of $1.6 million.

The candidate who reported having spent the most was Brown, with over $9.6 million in operating expenditures. As was the case with contributions, Moreno also came in second on campaign spending, with just over $5.2 million spent on operating expenditures. Dolan spent over $4.2 million and LaRose spent barely over $1 million.

Perhaps the most significant advantage for Brown was cash on hand, as he is reported to hold more cash than his three opponents combined at over $14.6 million. Dolan was second with over $4.8 million. Moreno’s was lower, with just over $2 million available to the campaign. LaRose came in last, with $771,611.50 cash on hand.

Additionally, each Republican candidate reported significant loans to their campaigns. Dolan, whose family owns the Cleveland Guardians, reported loaning $7 million to his campaign. Moreno, a former Cleveland car salesman and tech executive, reported $3 million. LaRose, who once called himself the only “thousandaire” in the race, reported making a $250,000 loan to his campaign. Brown reported that he made no loans to his campaign.

Earlier disclosure documents revealed a wide discrepancy in the candidates’ personal finances.