The world became a more dangerous place this week with the assassination of Benazir Bhutto in Rawalpindi, Pakistan. The country, a linchpin in the war on terrorism, is wracked with violence, endangering not just Pakistanis but all of us. If Islamic fundamentalists are able to exploit the current chaos and gain control of the government -- an unspeakable but not inconceivable possibility -- we will be faced with a nuclear-armed enemy rather than one that relies on suicide belts and roadside bombs.

All of this should focus voters in Iowa and New Hampshire, who are about to make their choice for Democratic and Republican presidential nominees. The winners in these respective races are not guaranteed to emerge as victors when their parties finally nominate candidates next summer, but they get a huge leg up, making it easier to raise money and garner media attention. Voters in these states, therefore, bear a heavy responsibility to pick wisely.

I'll leave it to other pundits to advise Democrats on their choice, but here's my take on the Republican race. Many of the Republicans, whatever else their appeal, simply don't have the experience to lead America during wartime.

Mitt Romney doesn't have the gravitas needed; he's too eager to please, willing to shape his positions according to the polls. Much the same can be said of Mike Huckabee, who despite his recent meteoric rise in popularity, is largely untested.

Duncan Hunter certainly has experience on his side. He's served in Congress for more than a quarter century, was chairman of the House Armed Services Committee and is currently the committee's ranking Republican, but he's raised almost no money and is in single digits in the polls.

Ron Paul, on the other hand, is a bona fide crank. This week we learned, for example, that he not only opposes the war in Iraq, but that he regards the Civil War as a mistake as well. Apparently he believes the Southern states should have been allowed to secede from the union in 1861. As for slavery, Paul says that it could have been ended by the federal government without a war. How? "You, you buy the slaves and release them," he told Tim Russert on "Meet the Press."

And Fred Thompson? He should go back to "Law and Order." He was far more inspiring playing a tough New York district attorney than he has been as a candidate. Late to get started, Thompson brings nothing new or unique to the race, and his record in the Senate was conservative but lackluster.

Which brings us to the only two candidates who are qualified by experience, character and temperament to become commander in chief: John McCain and Rudy Giuliani.

Like most conservatives, I don't agree with each and every position taken by either McCain or Giuliani. Of course, I can't remember any presidential nominee whose positions I've agreed with 100 percent. Yet, I could vote enthusiastically for either man for much the same reason I voted for Ronald Reagan in 1980, the first time I cast a vote for a Republican nominee. Continued...