Charlie Crist's Run as an Independent Could Begin By Vetoing SB6
Yes, the Crist campaign has issued sternly worded statements that he wouldn't run as anything other than a Republican. However, Crist would say that those statements came from his campaign manager and not him personally, while stressing that he, personally, is still a Republican even though he'd no longer be seeking the official nomination. Crist also dodged the question of a possible indie run today.
The accuracy of this theory could be tested when Crist decides whether or not to veto the controversial SB6 education bill.
WSJ's sources speculate Crist would begin issuing vetoes against some Republican legislation to reinforce his position as a populist and make himself more palatable to moderate Republican, independents, and Democrats.
SB6 is strongly supported by Jeb Bush and current RPOF Chair John Thrasher, and Rubio has spoken positively of it.
The bill would eliminate tenure for public school teachers, and 35 percent of Miami-Dade teachers staged a "sick-in" on Monday, skipping class to protest the bill. It would also tie teacher's pay to student test scores.
Crist has said he's been "communicated" with, declining to use the word "lobbied," on this issue harder than any other bill since he's been Governor and says he will have to seriously consider the bill before he signs or vetoes it.
If Crist succeeded as an independent, it's speculated he would still caucus with the Republicans. Whether or not certain members of the caucus would be open to having him is a whole other question.