When the Latino Community Foundation sent questionnaires to the Democratic presidential candidates asking where they stood on issues such as education, health care and immigration, the result was hardly what it anticipated: no response at all.

Even after the deadline was extended, nine out of 15 candidates didn’t submit answers, including former vice president Joe Biden.

When the League of United Latin American Citizens, the country’s oldest Hispanic civil rights group, invited Pete Buttigieg to events in Milwaukee and Des Moines, the South Bend, Ind., mayor declined. When the National Association of Latino Elected and Appointed Officials held a summit this summer, Biden and Sen. Cory Booker (D-N.J.) did not attend. Both passed on a second chance to address the legislators in the fall.