If the GOP does particularly well in the midterms, it's pretty clear that the Dems need to follow their example and make up as many false smears as possible. It doesn't really matter how plausible they are. Death panels. Government takeovers. Socialism. Etc. We need to formulate our equivalents.
You already do. "The Republicans healthcare plan is don't get sick... and if you do get sick, die quickly."
Really, outside healthcare (a very divisive issue) Republicans have been no worse than Democrats were in the Bush years.