ANOTHER VIRGINIA INSURRECTION. – There seems to be a very active and formidable rebellion on foot in Virginia against the National Administration. Both the leading organs of the Democratic Party at Richmond denounce the policy of the President with great vehemence. His Pacific Railroad scheme – his general extravagance, and the thirty million scheme have found scarcely any favor among the Democrats of the Old Dominion. And now the Enquirer is out against the whole project of acquiring Cuba, and submits some very forcible arguments in support of this view.