Sen. Claire McCaskill, D-Mo., raised a hefty $2.3 million during the first three months of 2012, bringing her cash on hand total to $6 million.
The sum is a significant increase from the $1.4 million she took in during the previous quarter.
None of the Republicans vying to take on McCaskill -- Republican Rep. Todd Akin, former Treasurer Sarah Steelman, or businessman John Brunner -- have released their fundraising numbers yet. Brunner is using personal own wealth to help fund his campaign, and McCaskill has outraised Steelman and Akin by huge amounts in previous quarters.
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