Rick Santorum is falling farther and farther behind Mitt Romney in the Republican convention delegate count. To reverse that, he needs to win his home state of Pennsylvania and then the southern states that follow.
The former Massachusetts governor and his allies spent hundreds of thousands of dollars more than Santorum and his backers in Illinois, and it showed in the results: Romney was beating Rick Santorum by 47 percent to 35 percent.
His win in the Illinois primary does not cement his status as eventual GOP nominee, but it certainly firms it up. The next primary, Saturday in Louisiana, does not favor Mitt Romney, but many of the April contests do.