I was mildly enthusiastic about the possible candidacy of Fred Thompson until I read this article by George Will.  Will slams him for supporting McCain-Feingold. 

Back then, Thompson
believed, implausibly, that voters are “deeply concerned” about
campaign finance reform. Today, many likely voters in Republican
primaries are deeply concerned about what Thompson and others
have done to free speech in the name of “reform,” as John McCain is
unhappily learning.