The Chamber of Commerce is becoming more active as this primary season wears on. On Monday the business group announced it is backing state Rep. David Rivera for the GOP nod in Florida's 25th district.

And over the weekend, the Chamber endorsed businessman Tim Bridgewater to win Tuesday's Senate primary in Utah.

Mario Diaz-Balart (R), who currently represents the 25th, announced in February he would run for his retiring brother's seat in the 21st district. Rivera is expected to be the nominee in the GOP-leaning district.

Rivera recently made news when it was reported that he failed to pay his mortgage for five months on a house in Tallahassee he co-owned with Marco Rubio, the Republican candidate for the Senate.