Missouri Sen. Claire McCaskill was on the Late Show with Stephen Colbert last night. In explaining the title of her book, she mentioned how she financially boosted the campaign for Republican Senator Todd Akin so she could whup his ass in the primaries. If you don't recall Todd Akin, maybe his quote will spark your memory "If it’s a legitimate rape, the female body has ways to try to shut the whole thing down.”
She wrote a blog on how she went about this. I think it's worth a read but here's my summary of it: http://www.politico.com/magazine/story/2015/08/todd-akin-missouri-claire-mccaskill-2012-121262
McCaskill paid for a Republican polling to find that Todd Akin was falling behind in the campaign at 17% and his major supporters were, far, far right. Two dog-whistling campaigns later, they made Akin sound too conservative. This broadened his appeal to the Tea Baggers, boosting his numbers to 38%, which is how he got in the primaries. Polling and two campaign blasts cost her a total of $1.7 million dollars. All this just to run against Akin so she could destroy him in the debates and get called "unladylike". She won the 2012 election. Then she shotgunned a beer.