Page "Electoral College (United States)" Paragraph 38

Eight states and the District of Columbia have joined the compact.

The first was Maryland, when Governor Martin O ' Malley signed the bill into law on April 10, 2007.

New Jersey joined on January 13, 2008, despite objections from Republicans who criticized the bill as undermining federal elections.

Illinois passed the law on April 7, 2008.

Hawaii joined on May 1, when the legislature overrode a veto from Governor Linda Lingle.

On April 28, 2009, the State of Washington joined, when Governor Christine Gregoire signed HB 1598.

Massachusetts joined the compact on August 4, 2010, when Governor Deval Patrick signed that state's bill into law.

Additionally, the District of Columbia, which has three electoral votes, joined the compact on December 7, 2010.

Vermont joined the compact on April 22, 2011, when Governor Peter Shumlin signed that state's bill into law.

On August 8, 2011 California joined when Governor Jerry Brown signed a bill adding California to the compact.

These adopters of the compact collectively have a total of 132 electoral votes, 138 votes short of the 270 needed for an electoral college majority.