It's easy enough to imagine a party marking this fine occasion, with antiwar protesters, civil libertarians, community leaders, environmentalists, health-care advocates and trade unionists clinking glasses to toast the end of an unfortunate era. Even Americans not normally inclined to political life might be tempted to join the festivities, bringing their own bottles of bubbly to the party. Given that presidential job approval ratings have rarely broken 40% for two years and now remain obdurately around or below 30% - historic lows - it would not be surprising if this were a sizeable celebration.