Vox has a good run-down on the not-so-unthinkable-again Mitt candidacy, among others:
1) The GOP field has weakened over the past year, and there’s no clear frontrunner
2) A Jeb Bush run looks unlikely
4) Romney can argue that he was prescient on foreign policy
6) His supposed weaknesses in a general election are overstated
Mitt Romney has effectively been running for president since his only successful election to a political office — the Massachusetts governorship — back in 2002. That’s roughly a decade spent pursuing the White House. Now, a new report by the Washington Examiner’s Byron York suggests Romney is seriously thinking of trying again.