Why do conservatives listen to lie after lie by republicans and
believe
every bit of it?

The same reason they believe that republicans are conservatives. Most
are inflicted with a terminal case of the simples. Conceptual thinking
or anything that can't be reduced to either/or, right/wrong, black/
white is not only confusing for them it also disturbs their sense of
well being. Thus the inordinately high number of evangelical
Christians, Southerners, white trash in the ranks. A very sad
phenomonon when you ponder it.