Of course you can.
Until the tyrant has grown to the point he destroys the balloting process and established himself as ruler for life, you can campaign for change in leadership. The encroaching tyranny we face has seriously eroded the value of the vote but not yet eradicated it.
Your electoral process has been subverted, undermined and compromised...Ya can’t flood the country with tens of millions illegally and expect a legitimate honest election process...
That’s pie in the sky... Not going to happen...