Desperation is the only reason as to why one party or "movement" would try to invoke class warfare. After all, class warfare is incited to divide - as opposed to unite - by pitting the classes against each other. Are voters smart enough to recognize a strategy as detestable as "divide and conquer"? One can only hope so.
Those despicable enough to use class warfare as a political or ideological strategy would be quick to recite the fallacy that the "rich get richer and the poor get poorer", however this is only intentioned to appeal to the most ignorant and uninformed of audiences. Class warfare may be good for a particular politician or political party trying to gain and/or maintain a position of power, however it is not good for the public - upper, middle, or lower class - and the mere mention of dividing people up into "classes" is in and of itself an unfortunate regression into divisive rhetoric that already gives the dividers an edge up on the proponents of unity.