Thus far, the Islamic State hasn't really been a big political issue. Politicians have offered different takes on it, but few are using the very fluid situation as a contrast in their campaigns.

Enter Scott Brown. In a new campaign ad, the Republican Senate candidate criticizes President Obama and Sen. Jeanne Shaheen (N.H.), Brown's Democratic rival, as seeming "confused about the nature of the threat" posed by the Islamic militants, who are pictured with their well-known black flag but not specifically named.

Rather than prescribe a policy overseas, though, Brown emphasizes the need for more border security and says he wants to "restore America's leadership in the world."

It's not the first time Brown has been out front on an issue. He was among the first to run an ad on illegal immigration, too. That issue has cropped up in a smattering of Senate races since then.

A few other Republicans have run ads citing the threat from overseas -- often in fairly broad terms, though. And ad for Senate Minority Leader Mitch McConnell (R-Ky.) earlier this month mentioned "ISIS" alongside some other major problems that constituted "serious times," which it argued that McConnell's Democratic rival, Alison Lundergan Grimes, wouldn't be prepared to deal with.