You can "insinuate", like they do: "Some say...".
I'm trying to figure out what's enjoyable about arguing with a Lefty - because they wouldn't recognize or acknowledge the truth if it whacked them over the head like the mighty bat of Sergeant Donny Donowitz.
My personal favorite FR anecdote is this:
The first spring that we really got going (1997), there was a Lefty contrarian whose screen nick was "esrosen", a real name and initials for a gal out of U of W-Madison.
Her constant refrain was that no Clinton admin type had ever been charged with a felony, unlike the previous Bushie administration.
All through the fall, we were WAITING for a chance to throw that one back in her teeth when one of the Clinton minions went to jail for a felony.
We waited and waited - until Big Bill left office.
I think she may have made a curtain call to rub in the fact that her spring 1997 statement was still true...
Because even though the Big Pantload himself had committed felonies - he wasn't prosecuted for them. And only non-admin minions took the felony falls.
I still remember that little lesson about arguing with the Left. :)