In our new Week in Midterms feature at Politics Nation, we noted the ad war that has been launched this week in the Kentucky Senate race. An ad for Secretary of State Trey Grayson (R) had challenged Rand Paul (R) on national defense, saying he "opposes the war in Iraq" and "doubts whether Afghanistan is still a threat."

Today, Paul is fighting back with a provocative spot that calls Grayson and Obama "dangerous allies."

The spot says Paul "believes a strong national defense is the most important responsibility of our government." It then says Grayson admitted voting for "draft dodger Bill Clinton," and shows a clip of Grayson pledging to work with President Obama.

The primary is May 18.

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