MIAMI (CBSMiami.com) – If you’re hoping to cast a ballot to pick one of the Republican candidates in Florida’s GOP Primary at the end of January, you have a little less than 48 hours to get registered as a Republican.

Based on a state law change, Tuesday is the registration deadline for the January 31st Florida primary. The requirements include: you must be at least 18 years old and a U.S. citizen.

READ MORE: Scott Carr Selected As FIU’s New Athletic Director

Florida’s primary is closed, which means only registered Republicans can take part in the January 31st primary. You can register at county elections offices, public libraries, and driver’s license offices.

All registration must be completed or postmarked by the end of business Tuesday.

Those who do head out to vote will face a decision among GOP frontrunners that include Newt Gingrich, Mitt Romney, Ron Paul, and Rick Santorum.

READ MORE: Homegoing Celebration, Funeral Service Set For Congresswoman Carrie Meek

Gingrich surged ahead in early December 2011, but millions of dollars were poured into attack ads in Iowa and Gingrich suffered in late December polling.

The most recent polling out of Florida showed Romney and Gingrich running neck and neck in the Sunshine State.

If Gingrich loses badly in Iowa, he will turn his hopes towards capturing South Carolina where he has a big lead. Then, all eyes will turn towards Nevada and Florida in the GOP primary calendar.

MORE NEWS: CBS4 Investigates: Hollywood Condo Building May Not Have Power Restored For Weeks

For more information on how to register in Broward County, click here. For Miami-Dade County, click here.