Several candidates for a Signing Day switch

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Every year, there are players who switch their commitments on National Signing Day, delighting some fan bases and infuriating others. This year there seem to be more candidates to switch than ever.
Here is a look at a few of them:
RB Trent Richardson: The nation's No. 2 running back and No. 6 player overall has been committed to Alabama since June, but he has a tough decision to make on Signing Day. Richardson has taken official visits to Florida, LSU and Florida State, and it wouldn't be a stunner if he changed his mind. But Alabama has the edge going into Wednesday.
LB Vontaze Burfict: Burfict is another national top-10 player who has been committed for quite some time but will really make his choice Wednesday. In this case the school he's committed to, USC, is the underdog. Burfict has been committed to USC since last February, but rumors are strong that he'll be signing with Arizona State.
DT Gary Brown: Publicly, Brown is listed as a solid commitment to Florida. Privately, there is more going on. Florida State has been making a strong push for Brown, who lives about 15 miles from Tallahassee, in Quincy. While most sources say he'll sign with Florida, there are some out there who think he might switch to FSU.
ATH Randall Carroll: As with Burfict, USC holds a commitment from Carroll, but the Trojans don't seem likely to sign him. Carroll has been committed to USC since the beginning of his junior season, but he opened things up this past summer. It seems as if UCLA is his likely destination. If it's not the Bruins, watch out for California and Arizona State.
WR Alshon Jeffery: He's another Southern Cal commitment who is looking around and won't decide until NSD. Jeffery, from St. Matthews, S.C., committed to the Trojans in June, but he opened up things in November and took official visits to Tennessee and South Carolina. There is a lot of talk about Jeffery deciding to stay closer to home and playing for either the Vols or Gamecocks. He could be the third Rivals100 prospect to de-commit from the Trojans and sign elsewhere.
Others to watch: RB Bryce Brown (Miami commitment looking at Auburn, Kansas State, Missouri, Oregon and USC), WR Andre DeBose (Florida commitment looking at Florida State), CB Janzen Jackson (LSU commitment looking at Alabama and Tennessee), WR Nu'Keese Richardson (Florida commitment looking at Tennessee), DT Sheldon Richardson (Missouri commitment looking at Miami) and ATH Marsalis Teague (Florida commitment looking at Tennessee and Alabama).