@JPB,
Re Ron Paul, I find some of his economic arguments interesting to discuss but totally impossible to implement (abolish the IRS, go back to the gold standard.)
Ron Paul will be 77 by election day, 2012. Only perennial candidate Harold Stassen (one time Repub gov on Minn) and Mike Gravel (Dem Senator of Alaska) were older among major candidates.
Ronald Reagan was about to turn 70 when his 1st term began and 73 at the start of his 2nd term.
His entry into the race as a Republican will make for somewhat more interesting debates.
I saw the headline on the Times' website about Huckabee. But I have used up my free views for May.