Caesar's Coming at You With a Big Army From Gaul

At this stage, pompey is seen as the air to sulla. So if we think of it in terms of defending their power, then the senate generally has more to gain by backing pompei. Also, caesar's coming at you with a big army from gaul. It's pretty plain what his agendar is going to be. Whereas pompeY, there's at least a bit of hedging of the bets that things might be ok. E, i don't want to say lesser of two evils, but they definitely know what the outcome would be wif caesar and that's one that they want to avoid.