Tim Bottaro was ready to endorse Kamala Harris. He planned an event for the California senator in Sioux City, Iowa, buying balloons to match her campaign’s colors.

But the morning before Harris was due to arrive, her campaign called the former Democratic Party chairman in Woodbury County to cancel, blaming a crucial Senate vote on disaster aid. To Bottaro, it sounded like an excuse — Harris canceled both days of her Iowa swing, while several other senators were able to make the vote and still get to Iowa that weekend.

He’s now decided not to endorse Harris, illustrating the risk candidates face if they leave Iowa residents with the impression that they’re not paying enough attention to the state’s coveted caucuses. Harris returns to Iowa this weekend promising renewed focus. But her relatively small staff and frequent travel to other places suggest Iowa isn’t the linchpin in her strategy to win the Democratic presidential nomination.

That’s prompting complaints across the state.