Sen. Claire McCaskill, Missouri Democrat, is being targeted for defeat in the 2012 elections. The Republican Party is portraying her as a free spender and one of President Obama's most reliable allies. (Associated Press)

Sen. Claire McCaskill, Missouri Democrat, is being targeted for defeat in the 2012 elections. The Republican Party is portraying her as a free spender and one of President Obama's most reliable allies. (Associated Press)