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(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

Keyes is making a third run at the presidency.

WASHINGTON (CNN) - Alan Keyes is hoping the third time’s the charm.

The conservative Republican is taking his third stab at running for the White House.

Keyes announced his candidacy Friday on a conservative radio talk show, saying he was unimpressed with the current GOP field.

“I just have been watching and following and haven't heard what is needed, and I think I'm like a lot of folks, who have just looked at it and been unmoved,” said Keyes, who also said he has filed the necessary paperwork with the Federal Election Commission to formalize his bid.

Keyes is a veteran at running for elective office. The former State Department official during the Reagan Administration ran unsuccessfully for the White House in 1996 and 2000. He also ran for the U.S. Senate in Maryland and in Illinois. That run, in 2004, ended in a landslide loss to Democrat Barack Obama.

Keyes teamed up with five other GOP presidential hopefuls last night at a “Value Voters” forum in Florida. The top four Republican candidates, Rudy Giuliani, Fred Thompson, Mitt Romney and John McCain did not attend the event.

– CNN Deputy Political Director Paul Steinhauser