Running for the US presidential office is very expensive, with expenses potentially reaching $1 billion. There are no limits on spending or when candidates can start for the US elections. Campaigns are funded by contributions from various sources, and while public financing was once common, private fundraising has become more popular. Federal law restricts donations from corporations, labor unions, and imposes limits on individual contributions. The Democrats are running the race with current VP Kamala Harris, while former US President Donald Trump is running for the Republicans in the 2024 elections.
