This is certainly true in a Congressional race. If you want to claim that your opponent is a lying sack of shit, you should use a word like "disingenuous." That means exactly the same thing, but it's oh so genteel.
When you start throwing grenades like "liar" around, and do it yourself instead of through a campaign manager, you're going to piss people off. That's one reason why Ron Angle is nearly as unpopular as he is popular. When he calls other elected officials "liars, crooks and phonies," they and their supporters tend to get offended. So do many neutral observers.
Ron gets away with it, barely, because he mocks himself as much as anyone else.
Bethlehem Mayor John Callahan is no Angle. He's pretty much incapable of self-examination, as demonstrated by his complete inability to accept any responsibility for Bethlehem's fiscal demise. He's failed to see the irony in touting job creation when he has imposed a hiring freeze and threatened layoffs at the City that is under his control. And now, in a fundraising email blast that went our yesterday, he's calling LV Congressman Charlie Dent a liar. "[H]e bought billboards lying about my record as Mayor," he petulantly whines. He is referring to one billboard Dent purchased along Rte 378 during Musikfest, which incidentally is accurate.
I suspect this personal attack reflects his growing desperation as it slowly sinks in that Hizzoner has picked the wrong time to run for Congress. What troubles me is that Callahan is slinging mud while Dent is serving this nation's interests overseas.
(You can see the offensive billboard ad here.)