Two national polling forms - Public Policy Polling and Rasmussen Reports, often at odds with one another - released polls showing McCaskill with a six point advantage over Akin.
Rasmussen's poll, which surveyed 500 likely Missouri voters, showed McCaskill leading Akin 51 to 45, the first time McCaskill has crossed the 50 percent threshold, the firm said.
Public Policy Polling, which surveyed 700 likely voters, showed McCaskill leading Akin 46 to 40. Still, the firm noted that by "a 50/42 margin voters would rather Republicans had control of the US Senate next year than the Democrats."
The two polls were released on the same day McCaskill announced her campaign had raised $5.8 million in the most recent fundraising quarter, a significantly higher figure than what Akin's campaign is expected to report.