MONTEVIDEO, Uruguay (AP) — Fifteen years of leftist rule hangs in the balance as Uruguay faces a tight presidential election that is likely to head to a runoff vote.

The left-leaning Broad Front coalition has governed the small South American nation since 2005 and its achievements include laws to approve gay marriage and the creation of the world's first national marketplace for legal marijuana.

But opponents have capitalized on growing disenchantment with the government over slowing economic growth and rising insecurity.

Polls give the Broad Front's Daniel Martínez, the socialist former mayor of Montevideo, an edge over his strongest rival, Luis Lacalle Pou, a centrist former lawmaker from the National Party. But neither is expected to get the 50% plus one vote needed to win outright and avoid a runoff in November.