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Rubio is running ahead of both Meek and Crist. In order to defeat Rubio, the Democrats wanted Meek to drop out of the race hoping that Meek followers would vote for Crist.
The Democrats aren't really excited about the turncoat Crist but he has the best chance of beating Rubio in a two-man race.
Ironically, it was the same Bill Clinton who campaigned for Meek just 10 days earlier as reported by The Palm Beach Post in the first link below.
The report at the second link details the story of the Bill Clinton effort to remove Kendrick Meek from the race to help Crist defeat Rubio.
A few days before Bill Clinton campaigned for Mr. Meek, Barack Obama also campaigned for Meek as reported in the third link below.
Now the Democrats want Meek out of the race, but he isn't quitting almost guaranteeing a Rubio win.
Link here, here and here.