The trend in the Republican vote share in the Rio Grande Valley from 2012-2020 is a gradual increase. While the region has traditionally been a Democratic stronghold, the Republican Party has made gains in recent years, particularly in 2020. In the 2012 presidential election, Republican nominee Mitt Romney received only 27% of the vote in the Rio Grande Valley. However, in the 2020 presidential election, Republican nominee Donald Trump received around 40% of the vote in the region. This suggests a significant shift in political allegiances in the area, although the Democratic Party still remains dominant in the Rio Grande Valley.