(CNN) - Heading into Tuesday's GOP Senate primary in Florida, Rep. Connie Mack is a heavy favorite to win the Republican nomination.
Mack, a four-term congressman, has maintained a steady lead in the months leading up to the contest, ahead of retired Army Col. Mike McCalister and former Rep. Dave Weldon.
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In a Quinnipiac University poll conducted in June, Mack had the backing of 41% of Republican registered voters, while his competitors trailed far behind in the single digits.
The winner of Tuesday's GOP contest will go on to challenge incumbent Democratic Sen. Bill Nelson in Florida, a crucial swing state in the presidential election.
In a hypothetical match-up with Nelson, a recent poll indicates the two term senator has a lead over Mack. Forty-seven percent of likely Florida voters said they would back Nelson, while 40% said they would choose Mack, according to the Quinnipiac University/New York Times/CBS Poll released August 1.
The Cook Political Report rates the seat as leaning toward the Democratic Party, while another political handicapper, the Rothenberg Political Report, describes the race as a "toss up/tilting Democrat" contest.
Mack enjoys the support of many high-profile Republicans, including those from both the establishment and more conservative wings of the party. Presumptive GOP presidential nominee Mitt Romney, former Florida Gov. Jeb Bush, Rep. Michele Bachmann, and Rep. Rand Paul are among those who fall in Mack's column.