What portion of the Congress or the states must support proposing an amendment to the Constitution for consideration?

http://www.lexisnexis.com/constitution/amendments_howitsdone.asp

Two- Thirds

To determine which portion of Congress or the states must support proposing an amendment to the Constitution for consideration, you need to refer to the United States Constitution.

According to Article V of the Constitution, there are two methods for proposing amendments:

1. Proposal by Congress: An amendment can be proposed by a two-thirds majority vote in both the Senate and the House of Representatives. Therefore, the correct answer is "Two-thirds."

2. Proposal by the States: Alternatively, an amendment can be proposed by a convention called by Congress when two-thirds of the state legislatures (i.e., 34 out of 50) request it. This method has not yet been used to propose any amendments to the Constitution.

In conclusion, the portion of Congress that must support proposing an amendment to the Constitution for consideration is two-thirds.