WASHINGTON (AP) — Hillary Clinton is kicking off early voting in Iowa today (Thursday), with a major effort to boost support in the battleground state. The Democratic presidential candidate will deliver a speech in Des Moines focusing on the childcare challenges faced by middle class families, according to a campaign aide.

Clinton backers also plan to host events in 10 Iowa cities today. Organizing early voting was a key piece of President Barack Obama’s strategy four years ago. More than 4 in ten Iowa voters cast ballots before Election Day in 2012.