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In one state, political ads may be conspicuous by their absence in '84. A bill now before the Maine Legislature would ban all political ads on TV in that state. Democratic state Rep. Neil Rolde, who introduced the bill, says support for his measure has been ''unbelievable'' from both his colleagues and the public, although some have questioned its constitutionality. ''Political ads don't give you any information on the candidates,'' says Mr. Rolde. ''They're on the same level as selling soap.'' At the same time, he says, the costs to candidates are tremendous.

''What I'm really after are those 30- and 60-second spot commercials,'' he says. ''I never heard as many people as I did in the last election tell me they were fed up'' with those ads.