That is definitely true - Republicans are held to a higher standard by leftists than Democrats are because of the basic Republican (Conservative, actually) belief in trying to adhere to a moral standard.
That’s why conservative commentators and writers go after conservatives doggedly (think: Mark Foley) while the liberals never go after liberals as doggedly (think: Eric Massa). We have a moral standard - stray away and expect to get called out. They do not have a moral standard. Their idea of morality is “it’s ok if we do it because we don’t espouse morality”.
No right or wrong. Libs are as slippery as a greased pig.