Permanent damage has been done by both political parties when they control Congress and or the Presidency. The proof is in the condition of the country today. Both parties had control of Congress and the Presidency at one time, and neither party did anything to change the result to positive.
This should be a lesson to the loyal party voter, the party, your party whichever one it is didn't save the country. So you can continue the system that has failed, or you can cross party lines to find the best candidate. Also, if an incumbent doesn't meet their promises from the last election, put them back in the private sector.