The Club for Growth has endorsed former Texas Solicitor General Ted Cruz (R), becoming the second national conservative organization this week to back him in the crowded GOP primary for retiring Sen. Kay Bailey Hutchison’s (R) seat.

“Ted Cruz will fight for economic liberty and will be a stalwart defender of the U.S. Constitution,” Club for Growth President Chris Chocola said in a Thursday statement. “He will be an ally for other pro-growth Senators and Texans will be proud to have him representing them in Congress. Club Members will do everything they can to see that Ted Cruz is elected as Texas’s next Senator.”

Cruz already scored an endorsement from FreedomWorks PAC, former Majority Leader Dick Armey’s organization, earlier this week. He also is backed by Sen. Mike Lee (R-Utah), a conservative with tea party backing who defeated Sen. Bob Bennett (R-Utah) in the 2010 primary.

The club’s endorsement is noteworthy given the crowded field of GOP candidates, which may not even be complete. Cruz, Railroad Commissioner Elizabeth Ames Jones, former Railroad Commissioner Michael Williams, former Dallas Mayor Tom Leppert and former Texas Secretary of State Roger Williams have announced campaigns, but Lt. Gov. David Dewhurst (R) — who would almost certainly be the frontrunner if he jumps into the race — is still mulling a bid.

Retired Lt. Gen. Ricardo Sanchez has announced he will seek the Democratic nomination.