Mullin ended the quarter with $71,103 in his account.
The other Oklahoma freshman, Tulsa Republican Jim Bridenstine, didn't make fundraising as high a priority as his colleagues and raised less than $20,000 in the first quarter. He finished March with $17,251.
Rep. Frank Lucas, R-Cheyenne, led all the Oklahomans in fundraising in the first quarter, collecting $232,739 in contributions, with nearly $191,000 coming from political action committees; much of the PAC money came from agriculture, finance and energy groups.
Lucas finished the quarter with $285,590.
Rep. James Lankford, R-Oklahoma City, raised nearly $43,000 in the quarter and had $303,421 in his campaign account.
Rep. Tom Cole, R-Moore, raised $66,750 and finished the quarter with about $798,000 in his account.