(CNN) - New Jersey Gov. Chris Christie is hitting the campaign trail once again for his good friend Mitt Romney.
With a lot riding on next Tuesday's primary in Illinois, where 66 delegates will be at stake, the former Massachusetts governor greets Republican primary voters at a pancake breakfast Friday morning in Rosemont. Following the event, Romney, the GOP front-runner in the battle for delegates, flies to Puerto Rico, which holds its primary on Sunday.
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That's when Christie steps in to lend a helping hand. Christie will headline an event Friday afternoon at Elmhurst College in the heavily Republican western suburbs of Chicago.
Christie, who's popular with Republicans across the country for his tough talk and tough actions in taking on Democrats in New Jersey, disappointed many in his party last October when he announced he would not launch his own bid for the GOP presidential nomination. Instead he endorsed Romney and has traveled to a bunch of primary and caucus states to stump for him, including Iowa, New Hampshire and most recently Michigan.
Illinois once looked like an easy contest for Romney but a poll released late last week by the Chicago Tribune indicated a tight contest between Romney and former Sen. Rick Santorum of Pennsylvania.