Mitt Romney reached the greatest level of support that any Republican candidate has enjoyed so far, according to a new Gallup poll, as the Illinois primary win and Jeb Bush endorsement has propelled him to a 14 point lead over Rick Santorum.

“Romney’s support has increased to 40 percent, the first time a candidate has reached that level in this campaign, and his lead over Rick Santorum [26 percent] is back into double digits after narrowing to four percentage points on March 20,” according to a new Gallup poll of national Republicans and GOP-leaning independents.