Our guests this week:

Mike Huckabee, former Arkansas governor, presidential candidate
Sen. John McCain, R-Ariz., presidential candidate

Just three weeks away from the Iowa caucuses and the race for president is shifting dramatically. This Sunday we'll bring you two of the top tier Republican candidates. Mike Huckabee has been enjoying a meteoric rise from the second tier to leader of the pack, according to one National poll. But will his limited resources take him beyond Iowa? We'll take a tougher look at the former Arkansas governor's campaign and his readiness to deal with issues such as healthcare and Iran.

Senator John McCain started the race as frontrunner, but quickly fell back into the pack. Now he's regained some momentum in New Hampshire with a major endorsement. But what can the Arizona senator do to convince the rest of America he's the man who should hold the highest office? We'll talk with the Arizona Senator only on "FOX News Sunday."

Plus, our panel on the Democratic race: Will Oprah's endorsement give Obama the push he needs? Our panel of Brit Hume, Washington managing editor of FOX News; Bill Kristol of the Weekly Standard; and Mara Liasson and Juan Williams of National Public Radio discuss this and more.

All of that and our Power Player of the Week: Samuel Lloyd III, dean of Washington National Cathedral.

So check your local listings and we'll see you on the next "FOX News Sunday."