(CNN) - National security has taken center stage just days before Hillary Clinton and Barack Obama go head-to-head in delegate-rich Ohio and Texas. Clinton released a new ad targeting voters' sense of security for themselves and their children. Obama fired back with an ad of his own trumpeting what he asserts is his superior judgment on issues of national security. Jessica Yellin reports from Houston, Texas.
National security was also on John McCain's mind Friday. The Republican front-runner hammered Clinton and Obama, suggesting their pledge to renegotiate NAFTA might endanger Canada's continued support of the U.S. military effort in Afghanistan. McCain also battled controversy as a Catholic group challenged McCain to reject the support of an evangelical pastor in Texas. Dana Bash reports.
Will the nation's largest minority voters make history in 2008 by determining the outcome of the White House race? John Zarella takes a look at Latino voters, an important demographic group in key states on the electoral map.
Finally, Jennifer Mikell brings you this week's Trail Mix - a look at the most memorable moments out on the trail.
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–CNN Associate Producer Martina Stewart