Vulnerable Sen. Claire McCaskill (D-Mo.) raised $2.3 million in the first three months of 2012 and ended March with about $6 million in cash on hand.

“Claire is humbled by the fact nearly 86 percent of her individual supporters gave less than $200. It’s this kind of grassroots support that helps us continue to fight back against the outside special interest groups,” McCaskill campaign manager Adrianne Marsh said in a statement.

Roll Call rates the race as a Tossup.