Democrats in the most liberal congressional district in the country, located in the South Bronx, face the possibility on Tuesday of nominating Ruben Diaz Sr., an anti-abortion, anti-gay marriage, Pentecostal pastor as their candidate for an all-but-guaranteed win.

The seat, which opened up with the retirement of Rep. Jose Serrano, has become a hotly contested struggle between the centrist and far-left wings of the Democratic Party. Diaz, a 77-year-old cowboy hat-wearing Puerto Rican, leads the field of 12 candidates. He’s a controversial figure in a district that gave 94% of its vote to Hillary Clinton in 2016. The pastor and city councilman who often declares that he doesn’t approve of drinking, smoking, or dancing also often decries gay marriage and abortion — two issues that have increasingly become litmus tests for membership within the Democratic Party.