WI Pompey defeats Caesar at the Battle of Pharsalus

Let's say Pompey the Great lives up to his title and ignores the bitching senators at Pharsalus, and delays the battle for another couple of days. The exhausted and starving Caesarian army puts up no resistance, and Caesar himself is captured and exiled to Palestine. Pompey, Cato, Cicero, Brutus and the others return to Rome in 47BC, proclaiming the Republic restored. What happens next?
 
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