NYT has all but written an obit for the Rubio campaign:

With Optimism Waning, Marco Rubio’s Campaign Labors On in Florida

This is what the political equivalent of hospice care looks like.

Senator Marco Rubio’s friends, supporters and aides use words like “miracle” to describe the likelihood of a victory here in his home state on Tuesday. They soldier on through sparsely attended rallies, insisting, Trump-like, that his crowds are larger than they appear.

His top donors, who gathered in Miami Beach for a two-day retreat planned as a victory party, are now contemplating a desperate Plan B: which candidate or which group they might instead pool their resources behind to stop Donald J. Trump.

Mr. Rubio’s campaign, once hopeful that Florida would be the final stop on his road to the nomination, has gone from fighting for its life to just getting through the day.

[…]

March 15th can’t come fast enough.