In 1994, Lacasa challenged incumbent State Representative Eladio Armesto-Garcia for re-election in the Republican primary in the 117th district, which was based in Coral Gables. During the campaign, Armesto-Garcia faced controversy over his decision to hire his ex-girlfriend as his district office secretary, and then to fire her the day after her daughter turned eighteen,[2] as well as whether he resided within the district.[3] In the primary election, Armesto-Garcia placed first with 42 percent of the vote, and Lacasa placed second with 33 percent, while businessman Leo Flores won 25 percent.[4] Because no candidate won a majority, a runoff election was held on October 4, which Lacasa narrowly won,[5] receiving 54 percent of the vote.[6] In the general election, Lacasa faced Democratic nominee James Bovell, an attorney.[7] He defeated Bovell by a wide margin, winning 67 percent of the vote to Bovell's 33 percent.[8]
In 1996, Lacasa ran for re-election, and was challenged by Flores and Ovidio Lopez-Fernandez, a Spanish-language newspaper publisher.[9] He defeated both in a landslide, receiving 76 percent of the vote to Flores's 16 percent and Lopez-Fernandez's 8 percent.[10] He was re-elected unopposed in the general election.[11]
Lacasa was unopposed for re-election in 1998.[12] In 2000, Lacasa was challenged by nonprofit executive and political consultant Ana Alliegro, the girlfriend of State Senator Alex Díaz de la Portilla, one of Lacasa's intra-party rivals, and John Robert Penland.[13] Lacasa narrowly won the primary without need for a runoff, receiving 51 percent of the vote to Alliegro's 43 percent and Fenland's 6 percent.[14]