Maybe if “Democrats” in Congress were acting like Democrats nobody would want to primary them?
BTW, the entire POINT of a primary election is for somebody of your own party to run against you, if you’re not doing your damned job.
Of course Bustos is from Illinois, so she probably thinks people like Rahm Emanuel & the Pritzker mafia are the ideal of what “Democrats” are supposed to be. Which means somebody should primary her ass in 2020. 
"Those who make peaceful revolution impossible will make violent revolution inevitable". - John F. Kennedy