National security issues loom large in Wisconsin's U.S. Senate race between Republican incumbent Ron Johnson and Democratic challenger Russ Feingold.
They disagree on how to fight the Islamic State terrorist group, what to do about Iran, and whether to send U.S. troops into foreign hot spots like Syria.
Johnson tried to portray Feingold as weak on national security. He portrays the former senator as a hypocrite who talks tough on the campaign trail, but cast senate votes that undermined the ability of U.S. troops to succeed.
Feingold says Johnson has no serious plan for fighting terrorism, supports proposals that would repeat past mistakes, and was ineffective as chairman of the Senate Homeland Security and Government Affairs Committee.
The candidates also have different approaches to issues like student loan debt. Feingold wants to lower interest rates on student loans and Johnson is pushing for more fundamental changes to higher education.