Gallup finds Perry leading Romney 29% to 17% nationally:

Perry's official entry has shaken up the Republican race, making him the new leader for the party's nomination. Gallup also finds Perry generating strong positive intensity among Republicans familiar with him, suggesting he has a strong initial base with potential to grow, given his below-average recognition. Still, he, like Romney before him, rates as a weaker front-runner than those in prior GOP nomination contests.

PPP has Perry at 33% and Romney at 20%: