Hillary Clinton might win Ohio on Tuesday, and Texas may essentially be a tie. But even if she loses both, she should continue her campaign. If she does, she may well beat Barack Obama for the nomination.

I am the last person who would give advice to Mrs. Clinton, and would not vote for either her or Mr. Obama. But someone needs to point out the obvious. I was inspired by the encouragement Forrest Gump received from his childhood friend, Jenny, who cheered him on with, “Run, Forrest! Run!”

The obvious fact is that Barack Obama is manifestly ill equipped to be commander-in-chief. It is not just that he lacks the knowledge and experience to lead our military or leverage American prestige on the world stage. He also lacks the wary eye towards possible danger—the vigilant stand on the ramparts—that we need in every president.

Americans saw this as recently as last week, when President Bush had to publicly admonish Mr. Obama for the senator saying that as president he would meet with Raul Castro without preconditions. The president had to explain to the inexperienced senator how such meetings would strengthen Castro, embolden his oppressive regime, and demoralize people in Cuba and around the world as to whether America stands ready to help them win their freedom.

That situation was compounded this week, when Hugo Chavez ordered Venezuelan troops to the border with Colombia and is conferring with the Ecuadorian government about using military force against Colombia for that country’s recent attack on terrorists hiding in Ecuador.

Mrs. Clinton sees Mr. Obama’s deficiency, which is why she aired her new ad, asking voters who they would want answering the phone in the White House at 3:00 a.m if there is an emergency.

Mr. Obama responded that such ads are fear mongering. In doing so, he shows again that he truly does not understand that the world is a dangerous place. An American president must keenly understand and be on guard against the many threats facing our nation. Barack Obama is not on guard, and is instead running on the idea that vigilance is a vice, not a virtue.

If Mrs. Clinton continues running, then under the Democrats’ proportional-allocation primary rules she will continue to get almost as many delegates as Mr. Obama, right up to the convention.

By convention time, both candidates should have over 1,400 delegates, not counting super-delegates. Since 2,025 votes are needed for the nomination, neither could secure the nomination until the Democrats hold their August convention.

It would be stunning for Mr. Obama to go all the way to August without a critical mass of voters waking up to the dangerous combination of his extraordinary inexperience, naïve foreign-policy beliefs and lack of vigilance against those who mean America harm. It takes more than a good speech to protect a county. Continued...