The Democratic party that meets today in Denver is one that many of its forebears would hardly recognize and might abhor. The determination to face down our enemies that characterized Harry Truman, the willingness to cut tax rates that John F. Kennedy showed, the pro-life convictions that informed Hubert Humphrey and Ed Muskie, even the free-trading instincts that Bill Clinton possessed — all have been banished from the party of Barack Obama and Joe Biden.

In place of these older political strains are a restless welfare statism; a hope, masquerading as a strategy, that we can talk and charm our way out of foreign crises; and a social liberalism that prefers the courts to do its heavy lifting. This party has found perfect exemplars of its ideology in its nominees.

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The most enthusiastic members of the Denver party believe that the country is finally, for the first time really, on their side. The nation’s and the party’s left is both enlarged and inflamed. The shrewder ones, who are calling the shots, hope that the public will be sufficiently disaffected with the Republicans to tolerate or overlook their ideology.

Thus the task before Obama and Biden this week is threefold. They must feign toughness on foreign policy and moderation on values. At the same time they must present their enthusiasm for bureaucracy as sympathy for the economic challenges of the middle class. They must persuade the country that they are not what they are: the most left-wing ticket their party has run in 36 years. You can’t fool all of the people all of the time; 51 percent may be more feasible.