All three of the formally declared candidates for the Republican nomination for President have signed the Taxpayer Protection Pledge. Senators Rand Paul, Ted Cruz, and Marco Rubio have signed a written commitment to the American people to “oppose and veto any and all efforts to increase taxes" if elected President.
Sens. Paul, Cruz, and Rubio have also signed and kept the Pledge as members of the U.S. Senate. Rubio signed and kept the Pledge as a member of the Florida House of Representatives and as state House Speaker.
"Elected officials face a choice: Reform government to cost less, or raise taxes instead of reforming government,” said Grover Norquist president of Americans for Tax Reform. “Senators Rand Paul, Ted Cruz, and Marco Rubio have made it clear that they stand with taxpayers now and in the future.” said Norquist.
With the exception of former Florida governor Jeb Bush, prospective GOP presidential candidates have signed the Pledge in their current or former capacity. As incumbent governors, Scott Walker (R-Wis.), Bobby Jindal (R-La.) have signed and kept the Pledge. Former Texas Governor Rick Perry signed and kept the Pledge.
In 2012, all candidates for the Republican nomination for president signed the Taxpayer Protection Pledge, with the lone exception of former Utah Governor Jon Huntsman. Huntsman dropped out of the race on Jan. 15, 2012 after finishing third in the New Hampshire primary.
ATR has shared the Pledge with all candidates for federal office since 1986. In the 114th Congress, 49 U.S. Senators and 218 members of the U.S. House of Representatives have signed the Pledge. This includes all members of the House and Senate GOP leadership as well as the chairmen of the tax writing committees, Rep. Paul Ryan (R-Wis.) and Sen. Orrin Hatch (R-Utah). On the state level, 13 incumbent governors and approximately 1,000 incumbent state legislators have signed the Pledge.
Update: On May 7th, Carly Fiorina signed the Taxpayer Protection Pledge becoming the fourth announced candidate for President to make a written commitment to "oppose and veto any and all efforts to increase taxes" if elected.