Con: While Gingrich covets the increased attention that comes from being covered as a potential presidential candidate, most Republican insiders think he will ultimately pass on a 2012 race. Although he is revered by conservative activists for leading the GOP to its first House majority in 40 years, many Republicans remember his tenure as Speaker as a stormy one. There is also a concern that Gingrich's personal and political baggage from the 1990s would impede the GOP's ability to make the election a referendum on the Obama administration.
Con: Despite his incredible win in the Iowa caucuses in 2008, Huckabee never put together the kind of national staff or national fundraising network which would have allowed him to overcome Sen. John McCain, R-Ariz., for the nomination. One reason why Huckabee did not advance further than he did was that he was targeted by the anti-tax Club for Growth which accuses him of going along with higher taxes in Arkansas during his tenure as governor. Huckabee's stock was hurt last year when word spread that he granted clemency to notorious cop-killer Maurice Clemmons. Although the clemency has not yet hurt his standing with the public, it will probably become the subject of attack ads if he becomes a candidate for the GOP presidential nomination. It's not clear whether Huckabee, who has put on weight since 2008, still has the same drive that he had last time.
Con: If Paul runs for president again in 2012, he will be forced to compete with former New Mexico Gov. Gary Johnson for the support of Libertarian-leaning Republicans. Paul would also be the oldest candidate in the field: He will be 77 by the next presidential election.