Steven Senne, Associated Press
SCHAUMBURG, Ill. — Backed by a crushing television ad advantage, Mitt Romney led Rick Santorum in the Illinois primary Tuesday night, according to exit polls, as he bid for victory in the latest big-state test in the race for the Republican presidential nomination.
Romney held a second advantage as well, this one in the competition for Illinois delegates to the party convention next summer. Santorum was ineligible for 10 of the 54 at stake after failing to field a full slate.
Preliminary exit poll results showed Romney preferred by primary goers who said the economy was the top issue in the campaign, and overwhelmingly favored by those who said an ability to defeat President Barack Obama was the quality they most wanted in a nominee.
The primary capped a week in which the two campaigns seemed to be moving in opposition directions — Romney increasingly focused on the general election battle against Obama while Santorum struggled to escape self-created controversies.
Most recently, he backpedaled after saying on Monday that the economy wasn't the main issue of the campaign. "Occasionally you say some things where you wish you had a do-over," he said later.
Neither Newt Gingrich nor Ron Paul campaigned extensively in Illinois.
Romney and Santorum did, though, and not always in respectful tones.
"Senator Santorum has the same economic lightweight background the president has," Romney said at one point. "We're not going to replace an economic lightweight with another economic lightweight."
Santorum had a tart reply. "If Mitt Romney's an economic heavyweight, we're in trouble."
Including Romney's victory last weekend in Puerto Rico, the former Massachusetts governor had 522 delegates going into the Illinois voting, according to The Associated Press count. Santorum had 253, Gingrich 135 and Paul 50. If Romney continues on the same pace, he will lock up the nomination before the convention opens in Tampa, Fla., next August.
However, the Santorum campaign argued Tuesday that the race for delegates is closer than that.
Santorum contends the Republican National Committee at the convention will force Florida and Arizona to allocate their delegates on a proportional basis instead of winner-take-all as the state GOP decided. Romney won both states.
On Tuesday, about four in 10 voters interviewed as they left their polling places said they were evangelical or born again. That's about half the percentage in last week's primary states of Alabama and Mississippi, where Santorum won narrowly. Despite an unusually lengthy race for the nomination, less than a third of those voting said in the polling-place survey they hoped the primary season would come to a quick end even if that meant their candidate might lose the nomination.
The findings came from preliminary results from the survey of 1,078 Illinois Republican voters, and had a margin of error of plus or minus 4 percentage points. The exit poll was conducted for The Associated Press and the television networks by Edison Research at 35 randomly selected polling places around the state.
As Illinois Republicans voted on Tuesday, Romney raised more than $1.3 million at a luncheon in Chicago. He planned an election-night event in nearby Schaumburg, Ill., while Santorum was in Gettysburg, Pa., site of Illinois favorite son Abraham Lincoln's most famous speech.
Santorum, the former Pennsylvania senator, has been seeking to make up in broadcast interviews what he has lacked in advertising money.
On Monday, his campaign began before sun-up and ended well after dark, including four appearances at rallies around the state as well as an extraordinary 19 radio and television interviews. He accused Romney anew of putting his signature on a Massachusetts health insurance law that is similar to the one Obama pushed through Congress.
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