Flooding the Zone / The Firehose of Disinformation seems to be the most prevalent strategy for running propaganda and forcing opponents to jump from hoop to hoop to address every fire. This is similar to the gish gallop debate strategy. A recommended technique in rhetoric is to simply focus on the easiest, most obvious thing to disprove, and repeat it. Over and over again.
I'm unaware if this has been tried on a national level, or historically. One commercial, broadcast everywhere, that simply says something like.
"Trump initiated the war in Iran. Gas prices are up. Democrats will vote to stop it."
Just a simple, factual statement, with no calls on patriotism, or implications of morality, culture, or anything like that. Short, repeatable, true.
Granted, individual candidates are forced to explain more of themselves to their constituents. It seems too simple to work, but has it been tried?