Gibbs's general message seems to be that the left's criticism risks being counterproductive and could imperil the Dems' broader agenda. But at the same time, in that last graf Gibbs is clearly conceding that White House attacks on the left are equally counterproductive. MORE...Howie P.S.: Wiktionary says
Awkwardly expressed but not necessarily untrue; impolitic; ill-phrased; inexpedient; clumsy.