BY JOE CONASON By all accounts, Hillary Rodham Clinton has not yet decided whether to seek the 2016 Democratic presidential nomination. But the prospect of her candidacy, combined with her undeniable popularity, is agitating certain commentators so deeply that they simply cannot withhold their bile. Consider the reaction of David Frum, a former Bush White House aide who often writes for the Daily Beast/Newsweek, CNN and other outlets about his dissatisfaction with the Republican Party. […]