How can the Marlins all of a sudden be back in the Fielder sweepstakes? After they lost out on Pujols, they were very clear that they had been pursuing Pujols because there was a compelling business case and that they did not think there was a business case for Fielder.
The business case for Pujols, aside from winning games, was that they thought he would increase attendance significantly by attracting the large Latin population that otherwise has not been very interested in baseball in Florida. (Whether or not that's valid I have no idea.) Now Fielder is not the player that Pujols is, but they would not have been interested even in Pujols except for the Latin factor. I think the Marlins were saying that Fielder is not going to attract an ethnic segment to nearly the extent that Pujols would (the black population in Miami is less than 20% while the Latin/Hispanic population is over 70%), so there is not the same business case, and so they are not going to pursue him.
So why would they change their minds on this?