I thought it took a 2/3's vote by congress, the President can veto laws/bills, but I don't think he can nullify or amend them (God I hope I am right).
Quote:
"The Amendment Process"
There are essentially two ways spelled out in the Constitution for how it can be amended. One has never been used.
The first method is for a bill to pass both halves of the legislature, by a two-thirds majority in each. Once the bill has passed both houses, it goes on to the states. This is the route taken by all current amendments. Because of some long outstanding amendments, such as the 27th, Congress will normally put a time limit (typically seven years) for the bill to be approved as an amendment (for example, see the 21st and 22nd).
The second method prescribed is for a Constitutional Convention to be called by two-thirds of the legislatures of the States, and for that Convention to propose one or more amendments. These amendments are then sent to the states to be approved by three-fourths of the legislatures or conventions. This route has never been taken, and there is discussion in political science circles about just how such a convention would be convened, and what kind of changes it would bring about.
Regardless of which of the two proposal routes is taken, the amendment must be approved by three-fourths of states. The amendment as passed may specify whether the bill must be passed by the state legislatures or by a state convention. See the Ratification Convention Page for a discussion of the make up of a convention. Amendments are sent to the legislatures of the states by default. Only one amendment, the 21st, specified a convention.
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So if you were a reasonable human being you would bitch at the congress, and not Bush for amending the constitution.