Here’s a chart of the major pols truth record since 2007 as far as Politifact fact checking is concerned. Do conservatives lie more often, or does is Politifact harder on them? The right wing US News and World Report cites a right wing study which suggests liberal bias in the fact-checking, though the article itself makes a poor case (unless you really believe that there’s a substantial difference between describing an event as “an act of terror” or a “terrorist act”).
Note that Bernie Sanders is credited with the most truth and no “pants-on-fire” lies. O’Malley also has no P.O.F. lies, but also hasn’t told the whole truth on anything Politifact deemed worthy of checking.
Couldn’t bring the names over with the graph, so you’ll just have to hit the above link to see who lies the most.