Texas Lt. Gov. David Dewhurst (R) was booed at his state party's convention on Saturday, a warning sign for the Senate candidate as he heads into his runoff against former Texas Solicitor General Ted Cruz (R) as well as a sign of the increasing discord within the state party.

Dewhurst received a tepid response to his speech and was booed when he sought to subtly attack Cruz and the outside groups backing him, according to the Texas Tribune.

"This runoff is a clear election between a lifelong conservative businessman, a conservative leader, a Washington outsider and a lawyer who is funded principally by Washington special interests," Dewhurst said, drawing boos and catcalls from the state party delegates in attendance.

Dewhurst drew more jeers when he attacked the fiscally conservative Club for Growth, which spent heavily for Cruz in the first round of voting, calling its members "Washington special insiders" who would run ads "attacking Texas."

Cruz was received much more warmly. Dewhurst, the establishment pick who has the backing of Gov. Rick Perry (R), took 45 percent of the vote in the first round of voting in late May, to Cruz's 34 percent. The two will face off in a late-July runoff, where Cruz is hopeful a low turnout and impassioned base will help him close the gap.